LSAT Quiz: Identify The Principle

What this quiz covers

This quiz focuses on Identify The Principle, giving you a quick way to practice the rules, question types, and explanations that matter most for LSAT.

How to use this quiz

Try each quiz question before looking at the correct answer. Use the explanations to review missed ideas, then come back to similar questions until the pattern feels familiar.

Question 1

1. If a procedural change can be generated automatically from existing electronic records, then a hospital should adopt it, because automated processes are inherently more reliable than tasks performed manually by clinical staff.
2. If a communication change preserves substantive content while reducing a common source of misunderstanding that contributes to a serious negative outcome, then the change should be adopted. (correct answer)
3. If simplifying patient communications would make instructions easier to understand, then a hospital should simplify all such communications, even when doing so requires removing the technical medical details some patients need.
4. If readmissions remain a serious problem for a hospital, then it should change its discharge procedures only after it has first reduced those readmissions through significant increases in nursing staff.
5. If some patients misunderstand their written instructions, then the hospital should focus its resources on educating those patients directly rather than on revising the written materials they receive.

Explanation: The argument says jargon causes misunderstandings, misunderstandings drive readmissions, and the template swaps jargon for plain language while keeping the same medical content. The principle that fits endorses adopting a communication change that preserves substantive content while reducing a common source of misunderstanding tied to a serious outcome—exactly the template's profile. The option about automation justifies the change for the wrong reason: it treats automatability, not improved understanding, as what matters, and rests on an unsupported claim that automation is always more reliable. The option urging simplification of all communications 'even when doing so requires removing the technical medical details' contradicts the argument, which insists the content stays the same; the argument supports simplifying presentation, not substance. The option requiring staffing increases first imposes a precondition the argument never accepts and would block the very change being justified. The option recommending patient education instead of revising materials rejects the argument's proposed solution rather than supporting it. Only the principle matching preserved content plus reduced harmful misunderstanding actually licenses the hospital's conclusion.

Question 2

1. If a method has a substantial tendency to produce error while less error-prone alternatives are reasonably available, one should not treat that method's results as conclusive. (correct answer)
2. If a method is capable of producing occasional errors, evidence obtained through that method should be excluded from consideration in any legal proceeding regardless of other factors.
3. When two independent investigative methods happen to yield the same identification, that shared result should be regarded as settled fact requiring no further corroboration.
4. If a witness appears highly confident in an identification, that witness's testimony should be treated as decisive regardless of the method used to obtain it.
5. A single piece of physical or testimonial evidence, however reliable, is never by itself sufficient to justify a criminal conviction in a serious case.

Explanation: The prosecutor concludes that the hypnosis-based identification should not be treated as conclusive, giving two reasons: hypnosis is prone to error (it inflates confidence and creates false memories), and reliable alternatives like physical evidence and surveillance footage are available. The correct principle links these exact conditions—a substantial tendency to produce error plus reasonably available less error-prone alternatives—to the conclusion that such results should not be treated as conclusive. That is precisely the bridge the argument needs. The choice barring any method capable of occasional errors goes too far; the prosecutor never claims hypnosis evidence must be excluded, only that it should not be decisive. The choice treating two matching independent methods as settled fact is irrelevant, since the prosecutor points to only one method and actually wants further corroboration. The choice making a confident witness's testimony decisive contradicts the argument, which distrusts the confidence hypnosis produces. The choice denying that any single piece of evidence can justify a conviction is overbroad and off-point—the prosecutor objects to this method's unreliability, not to relying on one item of evidence in general.

Question 3

1. A witness who expresses strong confidence in an identification provides a reliable indicator of accuracy, even when the identification procedure was known to be suggestive.
2. When the method of producing evidence is systematically biased and avoidable, the evidence should be excluded despite superficial indicators of credibility. (correct answer)
3. Every eyewitness identification carries some risk of error, so all such identifications should be excluded from trial regardless of how they were obtained.
4. Any evidence possessing some probative value should be admitted, and concerns about the reliability of the procedure that produced it go only to its weight.
5. The task of deciding which evidence is reliable belongs to juries rather than to judges, whose role is limited to instructing on the law.

Explanation: The judge's reasoning is that evidence generated by a procedure that is both suggestive and avoidable should be kept out, even if the witness seems credible. The correct principle states exactly this: excludable when the method is systematically biased and avoidable, despite surface credibility. The option treating strong witness confidence as a reliable indicator of accuracy is wrong because the judge explicitly discounted confidence, saying suggestive procedures distort memory. The option excluding all identifications is overbroad — the judge objected only to suggestive, avoidable procedures, not to eyewitness evidence as such. The option admitting anything with some probative value directly contradicts the ruling, since it would let the tainted identification in. The option assigning reliability decisions to juries misdescribes the judge's role; here the judge decided admissibility, which the principle must justify, not shift away.

Question 4

1. When procedural rules governing a binding decision are unclear and risk undermining legitimacy, the decision should be delayed until the rules are clarified. (correct answer)
2. Whenever any member of an organization expresses even a minor concern about a pending vote, that vote should be postponed until the concern has been fully addressed.
3. An organization must always follow its bylaws exactly as originally written, even when those provisions are found to be internally contradictory or unclear.
4. The most reliable way to resolve any dispute over procedure is to hold a binding vote immediately, before disagreement among members can grow further.
5. Whenever a governing procedure is genuinely disputed, the organization's current officers should be empowered to decide the outcome on the members' behalf.

Explanation: The organization is delaying a binding vote precisely because the rules controlling eligibility are contradictory, and going ahead could make the result seem illegitimate. The correct principle matches this exactly: unclear procedural rules that threaten legitimacy justify postponing the decision until they are clarified. The choice about postponing whenever any member voices even a minor concern is too broad—the group acted on genuine rule ambiguity, not on any complaint. Insisting the bylaws be followed exactly as written ignores that the provisions actually conflict, so 'as written' gives no usable answer. Recommending an immediate binding vote is the opposite of what legitimacy requires here; rushing would produce the very illegitimacy the group is avoiding. Empowering the current officers to decide the disputed procedure bypasses the fair, properly noticed amendment process the group chose, and lets interested parties settle a rule about their own election. Only the first principle explains why waiting to clarify the rules is the justified course.

Question 5

1. If an action has always been followed by the absence of a certain problem, then performing that action ensures that the problem will not occur afterward. (correct answer)
2. If a problem such as an emergency repair is costly, then any procedure that might plausibly reduce how often it happens should be made a formal requirement.
3. If technicians conscientiously follow an established procedure before closing, then any problems that arise afterward must be due to factors entirely outside their control.
4. If a building has no emergency repair calls during a given weekend, then whatever maintenance procedures were used that week were clearly adequate and complete.
5. If a maintenance procedure is made mandatory for all technicians, then it will as a result be performed carefully and completely on every single occasion.

Explanation: The manager reasons from a perfect past pattern to a guaranteed future result: because completing the checklist has always been followed by a repair-free weekend, doing it this Friday guarantees a repair-free weekend. Only the principle that an action always followed by the absence of a problem thereby ensures that problem won't recur supplies exactly that guarantee, so it justifies both the prediction and the recommendation. The principle about costly problems tells us a preventive procedure 'should be required' based on value, but it never lets you predict that no calls WILL occur this weekend, so it can't support the factual prediction the argument makes. The principle that later problems must be outside technicians' control doesn't establish that no problems will occur—it only reassigns blame if they do, which is irrelevant to the manager's guarantee. The principle running from 'no calls this weekend' to 'procedures were adequate' reverses the needed direction; the argument moves from completing the checklist to no calls, not backward from no calls. The principle that making a procedure mandatory ensures careful performance addresses how well a required task is done, not whether performing it prevents emergency calls, so it bridges the wrong gap.

Question 6

1. If an article is interesting, then it should be published even if its claims are unverified.
2. If a policy exists, then it should never be applied when the outcome might be controversial.
3. If a submission meets the relevant conditions specified by a publication's policy, then the publication should act in accordance with that policy for that submission. (correct answer)
4. If two sources agree, then they must be correct, regardless of their independence.
5. If quotations are recorded, then the overall interpretation in the article is necessarily accurate.

Explanation: The editor's argument exemplifies policy-based decision-making where established criteria determine outcomes. The editor notes that the article's claims are confirmed by two independent sources with recorded quotations, and that the publication's policy requires publishing investigative pieces when central claims are independently verified and properly documented. Since the article meets these policy criteria, the editor concludes it should be published. This reasoning assumes that when submissions satisfy the stated conditions of a policy, decisions should follow that policy. The principle treats established criteria as binding guidelines that should be applied consistently when their conditions are met. Answer choice A is tempting because it mentions verification, but it misses the crucial element of following established policy—the argument isn't about publishing interesting but unverified content, but about applying consistent standards. The strategic insight is that principle questions about institutional decisions often focus on whether established procedures should govern outcomes.

Question 7

1. Reliable evidence must always be admitted at trial, regardless of how officials happened to obtain it or what rights were violated.
2. When admitting reliable evidence would materially encourage future violations of rights, courts should exclude that evidence to deter such violations. (correct answer)
3. Courts should respond to unlawful searches by disciplining the responsible officers directly, rather than by excluding the reliable evidence those officers obtained.
4. Evidence gathered through an unlawful search is necessarily unreliable, so courts may safely exclude it without sacrificing any probative truth.
5. The primary purpose of courts is to discover the truth, so reliable evidence should be admitted whenever it advances that goal.

Explanation: The judge's reasoning treats deterring future rights violations as a value that can outweigh admitting reliable evidence. The correct principle states exactly that trade-off: when admitting reliable evidence would materially encourage future rights violations, courts should exclude it to deter them. This matches the judge's stated rationale and justifies the ruling. The principle that reliable evidence must always be admitted regardless of how it was obtained directly contradicts the ruling, since the judge excluded reliable evidence. The principle that courts should discipline officers rather than exclude evidence endorses a different remedy than the one the judge chose, so it cannot justify excluding the evidence. The claim that unlawfully obtained evidence is necessarily unreliable contradicts the passage, where everyone agrees the evidence is highly reliable; the judge excludes it despite its reliability, not because it lacks reliability. The principle that the court's primary purpose is discovering truth points the wrong way—it favors admitting reliable evidence, which is the opposite of what the judge did. Only the second principle supplies the deterrence-over-truth priority the judge actually invokes.

Question 8

1. A tech blogger refused a free device and posted a review without any disclosure; readers deemed the review unreliable for lacking disclosure.
2. A film critic accepted travel funding from a studio but disclosed it a week after the review appeared; the review was regarded as reliable.
3. A food critic accepted a gift from a restaurant she does not review; she posted a review of another restaurant without disclosure and was criticized as unreliable for failing to disclose.
4. A book reviewer disclosed that a publisher once sponsored a conference they attended, but having refused benefits for the particular book, the review was still considered unreliable.
5. A fashion vlogger accepted clothing from the brand she reviewed, did not disclose it in the video, and viewers concluded her review was not reliable. (correct answer)

Explanation: The principle requires disclosure when benefits are accepted from the company being reviewed and deems the evaluation unreliable if disclosure is not made, which E exemplifies. The other choices either treat nonrequired disclosures as necessary or treat belated or missing required disclosures as compatible with reliability.

Question 9

1. Because consumers are typically skeptical of early scientific claims, researchers gain little by announcing preliminary results before those results have been formally confirmed.
2. Scientists should always avoid interacting with the media about their ongoing research until every stage of that research has been completed and reviewed.
3. If a study is likely to be replicated by an independent lab, then its preliminary results are necessarily trustworthy enough to report publicly.
4. One should refrain from publicizing tentative claims when doing so risks misleading the public and verification is reasonably forthcoming. (correct answer)
5. A scientific claim should not be believed or announced by anyone until every laboratory in the field has independently replicated it.

Explanation: The keyed principle fits Dr. Lin's reasoning exactly: it says to hold back tentative claims precisely when publicizing them risks misleading people AND confirmation is coming soon. Both conditions match the passage—the results are preliminary, publicity could mislead consumers, and replication is feasible within months. The claim about consumers being skeptical only tells us publicity is ineffective, not that it is irresponsible; it misses the harm-and-verification logic Lin relies on. The principle that scientists should always avoid media until research is fully complete is far too broad—Lin objects only to unconfirmed claims that could mislead, not to all media contact. The idea that a likely-to-be-replicated study is already trustworthy actually cuts against Lin: if that were true, she could announce now, so it cannot justify delay. The demand that every laboratory replicate a claim sets an impossibly high standard that Lin never endorses; she wants one independent replication, not universal confirmation. Only the keyed choice captures both the risk-of-misleading condition and the timely-verification condition that together make delay the responsible choice.

Question 10

1. If a tool improves performance for one department during a given quarter, it should be adopted by every department companywide, regardless of whether their underlying tasks are actually similar.
2. Any procedure that reorganizes existing steps without adding new ones will reliably improve efficiency in any workplace setting, regardless of the particular task the workers happen to perform.
3. If a work tool improves speed without increasing workload for a group performing a given task, then it is sensible to require all groups performing that task to use the tool. (correct answer)
4. A tool should be required across an organization only after it has been formally tested in multiple teams over several quarters, consistently improving both speed and accuracy each time.
5. If a tool improves speed for a team, it is sensible to recommend that tool to other teams, but never to require it, unless the tool also demonstrably reduces errors.

Explanation: The manager's argument moves from a general rule to a specific policy: because the checklist improved speed without adding workload, every team doing this task should be required to use it. The correct principle mirrors that structure exactly—same conditions (improves speed without increasing workload), same scope (all groups performing that same task), and same force (require, not merely suggest). The department-based option overreaches: it justifies adoption regardless of whether the tasks are similar, but the argument only supports spreading the tool among groups doing the same support work. The reorganization option asserts that merely reordering steps guarantees efficiency everywhere—a claim stronger than the argument makes, since the argument relies on observed speed gains, not on reordering alone. The multi-quarter testing option imposes a stricter requirement (repeated trials, proven accuracy) that the manager never invokes and that would actually block the conclusion. The recommend-but-never-require option directly contradicts the argument, which concludes the tool should be required; it also adds an error-reduction condition the argument does not use. Only one option matches both the logical structure and the task-specific scope of the manager's reasoning without adding or contradicting a condition.

Question 11

1. When a program charges the public no admission fee, governments should cancel it before any program that generates revenue, regardless of the community benefit it provides.
2. When funding decisions must be made, a program's demonstrated popularity with residents is the only factor a government may legitimately weigh, regardless of urgency.
3. When a program generates substantial community goodwill, a government should preserve it even during a budget crisis, ahead of repairs to essential infrastructure.
4. When resources are insufficient to meet essential public needs, governments should prioritize those needs over nonessential amenities, regardless of popularity. (correct answer)
5. When both arts programming and infrastructure require support, a city should devote equal funding to each, dividing scarce resources evenly regardless of relative urgency.

Explanation: The mayor argues that when existing revenue cannot cover core public needs, essential services must come before discretionary entertainment. The correct principle states exactly this: when resources can't meet essential needs, prioritize those needs over nonessential amenities regardless of popularity. This licenses cutting the popular concerts to fund water mains and emergency services. The option that says free programs should always be cut first uses admission price, not essentiality, as the deciding criterion, so it doesn't match the mayor's reasoning. The option making popularity the only legitimate factor actually argues against the mayor, since the concerts had record attendance. The option protecting any program that generates goodwill even during a budget crisis reverses the mayor's priority, favoring the amenity over essential infrastructure. The option demanding equal funding for arts and infrastructure would forbid the mayor's choice to fully fund essentials first. Only the keyed principle both ranks essential needs above amenities and treats popularity as irrelevant to that ranking, which is precisely what the argument needs.

Question 12

1. A vendor should be renewed whenever it offers the lowest price, regardless of any other aspect of its performance.
2. If a vendor's occasional service failures are promptly remedied at no additional cost and the vendor provides the best available price for a fixed-budget customer, then the vendor should be retained. (correct answer)
3. A vendor should be renewed only if it has never failed to meet its stated service standards.
4. Whenever a customer has a fixed budget, it should always choose the least expensive option even if doing so reduces the quality of service.
5. A vendor should be renewed if it corrects its mistakes faster than its competitors correct theirs.

Explanation: The argument reasons that because the printing company offers the lowest prices (crucial for a fixed budget) and quickly remedies its occasional failures at no extra cost, the contract should be renewed. This reasoning pattern requires a principle that justifies retaining a vendor when cost savings outweigh minor service issues that are promptly corrected. Answer B perfectly captures this logic by stating that a vendor should be retained if it provides the best price for a fixed-budget customer AND promptly remedies occasional failures at no cost. Answer A is tempting but too extreme—it says price alone matters "regardless of any other aspect," while the argument actually considers both price and the vendor's response to failures. The key insight for principle questions is to match not just the conclusion but the specific reasoning structure: here, the argument balances multiple factors (price and service recovery) rather than focusing on just one.

Question 13

1. A city should always enact whatever policy maximizes overall economic efficiency, even when doing so ignores the specific comfort or complaints of individual residents.
2. Any commercial practice that residents find annoying should be eliminated outright, regardless of the cost or the practical difficulty that ending it would impose on businesses.
3. A new regulation on local commerce is fully justified whenever even a single resident has lodged any complaint about the activity that the regulation would restrict.
4. If a policy significantly reduces public harm while imposing only minor, feasible adjustments on affected businesses, the policy is justified. (correct answer)
5. Any established practice that benefits local businesses should be preserved and protected unless the affected residents come to oppose that practice unanimously.

Explanation: The council weighs a real public harm (lost sleep) against the modest, workable cost to businesses of shifting deliveries, and concludes the ban is warranted. The keyed principle states exactly that trade-off: a policy is justified when it significantly reduces public harm while requiring only minor, feasible business adjustments. That mirrors the council's reasoning precisely. The principle demanding a city always maximize economic efficiency is wrong because the council's aim is reducing noise, not maximizing efficiency, and it accepts some cost to do so. The principle that anything residents find annoying must be eliminated ignores the survey's crucial point that the burden on businesses is small and feasible—it would justify the ban even if the cost were ruinous. The principle that a single complaint fully justifies regulation sets far too low a threshold and disregards the council's balancing of business impact. The principle that business-benefiting practices survive unless residents oppose them unanimously sets an extreme, one-sided bar the council never invokes. Only the balancing principle captures both halves of the council's argument.

Question 14

1. If a policy has a heavier impact on low-income people than on others, then it should be eliminated for that reason alone, regardless of whatever additional benefits or protective functions the policy might still provide.
2. If comparable institutions have removed a policy without worsening the primary risk the policy was meant to prevent, and removing it would reduce barriers to access, then the policy should be removed. (correct answer)
3. If a policy has already been in place for many years and is familiar to patrons, then it should be retained rather than revised, because institutional stability matters more than experimenting with untested alternatives.
4. If changing a policy would measurably reduce the administrative workload that falls on staff, then the change should be adopted, whatever its effects on patrons or on the risks the policy was designed to address.
5. If a policy is unpopular with some segment of patrons, then it should be eliminated to satisfy them, even when the policy still serves an important function that those patrons may not fully recognize.

Explanation: The argument leans on two things at once: evidence that comparable libraries dropped fines without more materials being lost, and the goal of removing an access barrier that falls hardest on low-income patrons. The principle you need must license the conclusion using BOTH of these. The correct choice does exactly that—it authorizes removing a policy when similar institutions removed it without worsening the feared risk AND removal reduces barriers to access, matching the argument's structure precisely. The choice about heavier impact on low-income people is wrong because it justifies removal based on disproportionate impact alone, ignoring the library's careful appeal to what happened at comparable institutions. The choice favoring long-standing, familiar policies actually points toward keeping fines, contradicting the argument's conclusion. The choice about administrative workload uses the wrong criterion entirely—the argument never mentions staff burden, so this principle wouldn't connect to the stated reasons. The choice about unpopularity would remove a policy merely because some patrons dislike it, even one that serves an important function; the argument, by contrast, relies on evidence that the feared harm did not materialize elsewhere. Only the second principle captures both the comparable-institution evidence and the access goal that the conclusion depends on.

Question 15

1. When a project promises substantial tax revenue and new jobs, it should be approved even if construction would eliminate a scarce natural feature that cannot later be restored.
2. If the benefits of a project can be realized without irreversibly damaging a unique natural resource, the resource should be protected and the project pursued by alternative means. (correct answer)
3. When economic development and environmental preservation come into conflict, the environmental interest should always prevail regardless of the jobs or revenue the project would otherwise generate.
4. Only projects that can be built entirely on land that has already been developed should be approved by a governing body weighing environmental costs.
5. Whenever a group of local residents voices organized opposition to a proposed project, the governing body should reject that project in favor of preserving the status quo.

Explanation: The council's logic is conditional: because the complex's benefits could be obtained on nearby vacant parcels, destroying the irreplaceable wetland is unjustified. The correct principle matches this exactly—when a project's benefits are achievable without irreversibly harming a unique resource, protect the resource and pursue the project another way. The option approving revenue-and-jobs projects even when they eliminate an unrestorable natural feature reverses the council's priority; the council did the opposite. The option saying environmental interests should always prevail is too strong: the council did not claim the environment always wins, only that it wins when benefits can be had elsewhere. The option permitting only projects on already developed land is overbroad—the council redirected this project but never adopted a blanket rule against all undeveloped sites. The option about rejecting any project that draws organized opposition is irrelevant; the council's reasoning turned on available alternative sites, not on the mere presence of opponents. Only one principle supplies exactly the conditional the council relied upon.

Question 16

1. A security measure should be adopted only if it eliminates every possible cause of security incidents.
2. If a low-cost measure directly addresses the primary source of a recurring problem, then adopting that measure is justified. (correct answer)
3. Any measure that improves security should be adopted, even if it creates major obstacles to productivity.
4. A measure should be adopted whenever it uses devices employees already own, regardless of its effectiveness.
5. A measure should be adopted only if it has been used for at least five years by a majority of competing companies.

Explanation: The company's reasoning centers on addressing the primary source of security incidents (80% involve compromised passwords) with a low-cost solution that directly blocks that specific vulnerability. The argument structure is: identify the main cause of a problem, propose a targeted solution that addresses that cause without significant cost, therefore implement it. Answer B captures this exact reasoning pattern by endorsing low-cost measures that directly address the primary source of recurring problems. Answer C might tempt those focused on security, but it goes too far by saying ANY security improvement should be adopted "even if it creates major obstacles"—the argument actually emphasizes the solution's practicality (using existing phones, no new hardware). For principle identification, focus on the specific cost-benefit reasoning the argument employs, not just the general topic.

Question 17

1. Individuals who voluntarily commit to provide a service should honor that commitment unless meeting it would impose an unusual hardship. (correct answer)
2. When a community obligation and a personal relationship conflict, people should always give the community obligation the greater weight.
3. Because they receive no compensation for their time, only paid workers rather than unpaid volunteers are truly obligated to keep scheduled shifts.
4. A person is bound to keep a commitment only in cases where breaking that commitment would result in some form of legal penalty.
5. A previously made commitment may be freely canceled whenever a more desirable or preferable opportunity happens to arise later.

Explanation: The coordinator concludes that Mira should keep her shift because she voluntarily signed up and no unusual hardship is present. The correct principle states exactly this: voluntary commitments to provide a service should be honored unless meeting them would impose an unusual hardship. That 'unless' clause matches the coordinator's own 'absent unusual hardship' carve-out, so it justifies the reasoning precisely. The principle ranking community duties above personal relationships is too broad and rests on the wrong criterion — the coordinator's point turns on the prior commitment, not on community always outranking friendship. The principle that only paid workers are obligated contradicts the argument, since Mira is an unpaid volunteer whom the coordinator holds accountable. The principle requiring legal penalties sets a standard the situation cannot meet; nothing legal is at stake, yet the coordinator still finds Mira obligated. The principle allowing cancellation for any preferable opportunity directly licenses what the coordinator opposes — dropping the shift for a dinner invitation. Only the first choice both fits the facts and supports the conclusion.

Question 18

1. If an event has been safe in the past, it will be safe in the future, regardless of any changes in circumstances.
2. Whenever a policy is written into an agreement, it will be followed exactly as written.
3. If a certain condition has always been followed by the absence of a particular outcome, then whenever that condition is present the outcome will be absent. (correct answer)
4. An activity should be permitted whenever it is popular and has few documented problems.
5. If an outcome has never occurred, then the conditions thought to prevent it are unnecessary.

Explanation: The argument establishes that in every past instance when the festival ended by 10 p.m., there were no arrests that night, then applies this pattern to predict that since this year's festival will end by 10 p.m., there will be no arrests. This reasoning relies on a consistent conditional relationship: whenever condition X occurred, outcome Y was absent. The correct answer (C) perfectly captures this principle: if a certain condition has always been followed by the absence of a particular outcome, then whenever that condition is present the outcome will be absent. Answer (A) might seem appealing because it deals with past safety predicting future safety, but it's too narrow and specific to "safety" while missing the conditional structure. The key to principle questions is recognizing that the correct answer must match both the logical form (here, a conditional guarantee) and the scope (any condition and outcome, not just safety or festivals).

Question 19

1. Those who profit from activities that foreseeably impose costs on others should bear the reasonable costs of preventing that harm. (correct answer)
2. When an activity generates local employment, the public should reasonably subsidize any environmental costs that activity creates for the community.
3. The party best positioned financially to absorb the expense should shoulder the reasonable costs of any environmental cleanup that arises.
4. Businesses that operate within a community are responsible for solving every social and environmental problem their activities happen to touch.
5. Taxpayers should never, under any circumstances, be asked to pay for cleaning up waste generated by private industrial operations.

Explanation: The councilor's argument rests on two facts: the firm profits from an activity that predictably creates cleanup costs, and prevention is achievable. The principle that those who profit from activities foreseeably imposing costs on others should bear the reasonable prevention costs matches this reasoning exactly, so it best justifies the position. The principle that the public should subsidize environmental costs whenever jobs are created actually supports the company, not the councilor, so it fails the ask. The principle that the party best able to pay should cover cleanup uses the wrong criterion—the councilor argues from responsibility and profit, not from ability to pay. The principle that businesses must solve every problem they touch is far too broad; the councilor only claims the firm should pay for harm it causes and profits from. The principle that taxpayers should never pay under any circumstances is an unsupported absolute that goes well beyond the councilor's narrow, qualified claim about this specific firm.

Question 20

1. If every member of a group has a certain ability, then any member of that group has that ability. (correct answer)
2. If some members of a group have a certain ability, then any member of that group has that ability.
3. If something can survive a winter, then it must be native to the region where it survives.
4. If something is native to a region, then it will thrive there under all conditions.
5. If an ability is valuable, then it should be the only factor in choosing among alternatives.

Explanation: The gardener claims that all native plants survive local winters outdoors, so the native silver sage will, undeterred by some nonnatives surviving with protection. This uses conditional reasoning where nativity sufficiently ensures survival. The principle must affirm that group membership guarantees the ability for any member. Choice A fits the logic and scope, emphasizing universality without implying exclusivity. A tempting wrong is C, which narrows to a reverse (survival implies nativity), failing to support the argument's direction. Match principles to the argument's reasoning mechanism, such as from category to attribute, rather than to exceptions or converse logic.