The pronoun "him" in this sentence is confusing and ambiguous, as it makes it unclear precisely to whom the pronoun is referring. By making it a reflexivepronoun, the sentence will be made much less confusing. The only choice that uses the reflexive pronoun is "for both the organization and himself," making it the correct answer.

The use of "they" in the underlined portion creates ambiguity and confusion, as it is unclear whether "they" refers to "employees" or "rages." Making the pronoun into a specific noun will clear up the confusion. The answer choice which best rids the sentence of its ambiguity is "as these rages often led to many people being fired."

The sentence is faulty because it uses a pronoun with an ambiguous antecedent. The reader can't be sure who either "they" or "them" is referring to -- the bankers or the computers. The error can be fixed by rearranging the sentence so that "they" is followed by the clarifying subject "bankers."

Answer choices "researchers have discovered several additional drugs that, when administered by a health care professional, has helped to reduce the risk of influenza" and "researchers have discovered several additional drugs that, when administered by a health care professional, helps in reducing the risk of influenza" contain subject-verb agreement errors because they use singular verbs—"helps" and "has helped"—rather than the plural verbs required by the plural noun "drugs."

The answer choices containing "they" as opposed to "researchers" are incorrect because they contain an ambiguous pronoun. We don't know to whom "they" refers.

The answer choice "researchers have discovered several additional drugs that, when administered by a health care professional, help to reduce the risk of influenza" is correct because it is the only answer choice that correctly avoids using an ambiguous pronoun and doesn't introduce any subject-verb agreement errors.

The use of "her" in the last phrase of the sentence, "her impatience," is confusing, as it is unclear whether this refers to the server or the customer. By using more careful and precise language, the sentence can be made less ambiguous. The only answer choice that properly clears up the pronoun confusion in this sentence without introducing new errors is "The server went to check on her last customer, who was frustrated by the server's impatience."

This sentence contains many errors: foremost, it is very ambiguous in the usage of the pronoun in its current form. It is unclear whether the sentence means that the charts are loved or Trina's song. Additionally, passive voice is used in this sentence when active voice is better for a relatively complex sentence like this one (i.e. The subject must do the action of the sentence) in standard English. The correct choice is, "Trina's new song, which many people love, topped the charts."

The sentence has a vague pronoun reference. The use of "their" before "prescriptions" is ambiguous because we do not know if "their" refers to the doctors' or the pharmacists' prescriptions. The sentence needs to clarify to whom the pronoun refers, so the best answer choice is the one that does this, "and many pharmacists regularly complain about doctors' prescriptions."

This is an example of an ambiguous pronoun. The "him" in "to give him away" in the original sentence could be applying to either the dog or the cat, so we must make clear that it is one or the other.

The word "it" in this sentence is ambiguous. In this situation, it is possible for the "it" to refer either to the car or the part installed. Take, for example, that he installed a new radio or speakers in his car. It is entirely possible that the car would be able to work when these components are not working and vice versa. Perhaps while installing the radio/speakers, this person accidentally cut a wire that was vital to some other electrical components of the car. It is possible that the car may not start fully (i.e. to be able to drive), but perhaps the radio might still turn on - at least for a bit. So, it is important to clarify this; the best choice is, "the part did not work properly" since it is the only choice that is not vague.

The sentence contains an ambiguous pronoun. Technically, the word "which" could apply to both "the tree" and "the park" in this sentence. The word order needs to be reorganized in such a way that it is clear which words specifically refer to which nouns. The correct choice is, "The beautiful park's largest tree is as old as the city" as all of the other sentences contain some degree of ambiguity. This choice is the only one that is specific and clear.