You likely have some exposure to the mythological character, Hercules (or Heracles), who in Greek mythology performed great deeds of strength. In English, to say something is “herculean” means that it is extremely difficult—as were his great labors. Thus, “herculean” stands as an intensified form of “difficult.” Your generalized bridge sentence would be, “As herculean things are very difficult, so X things are very small.” If something is minute, it is very small. Do not confuse this with the word for the division of time. The word is related to words like “miniscule” and “miniature,” each implying some degree of “smallness.”

Something immaculate is very clean. Roman Catholics speak of “Immaculate Mary,” meaning thereby to attribute absolute purity from sin to Mary, the mother of Jesus. The bridge sentence for our analogy could be formulated as, “As something very neat is called immaculate, so too is something very noisy called X.” Something raucous is disturbing and loud. Often, one will speak of “raucous partying,” implying by that “loud partying.” In general, something is “raucous” if it is loud and unsettling. For this reason, it fits the analogy, meaning well enough “very noisy.”

Something is gory when it is covered with blood, often shed because of violence. Thus, “bloody” is either a synonym or at least a characteristic of something that is “gory.” When something is “saturated,” it is completely filled. This word is most frequently used to mean “completely filled with water,” like a sponge that is fully saturated. The word is used in scientific expressions like “saturated fats” because these compounds are completely full of a particular kind of bond—they are saturated with them.

Something spiteful is nasty, as in spiteful speech that is meant to “tear down” someone else. Such actions cause hurt and pain, generally psychological but still real. Thus, the analogy could be written, “As something spiteful causes hurt, so does something blazing cause X.” A blaze is a strong fire, which can at least be said to produce heat. While this is not the most advanced vocabulary, it is the only option that describes an effect of something blazing.

"Lucky" and "fortuitous" mean roughly the same thing, just as "drab" is another word for "dreary."

"Adroit" is another word for "skillful;" similarly "illustrative" and "explanatory" mean roughly the same thing.

"Combustible" and "explosive" mean the same thing; just as "pliable" and "flexible" are synonyms. 

Someone who is “iniquitous” is very immoral or wicked. Therefore, our bridge sentence is, “Just as something iniquitous is very immoral, so too is something X very possible.” Among the options provided, “probable” is the only word providing a sense of being “very possible.” The options “feasible” and “viable,” while they do connote that something is indeed a possible option, do not connote the sense of being “very possible.”

"Relaxed" and "carefree" are both synonyms, just as "stressed" and "burdened" have a similar meaning.

"Dessicated" and "dry" are synonyms, just as "drenched" and "wet" have the same meaning.