"Perturb" means worry. if you are feeling "perturbed," you are feeling worried and uncertain. To further help you, "desire" means want; "admire" means appreciate.

"Fret" is a verb meaning to worry excessively. For example: "The vicious guard dog caused all intruders to FRET regarding their safety."

"Soothe" is a verb that describes the action of calming someone down, often an action done to someone who is "fretting." "Halt" is a verb meaning to stop an action or movement. As a verb "silence" means to make, usually someone else, be quiet.

To "abhor" something is to loathe, despise or hate it. You might "abhor" violence and refuse to watch TV shows that use violent imagery.

"Covet is an antonym to "abhor." "Instigate" is a verb meaning to cause an event or arouse an emotion that causes action. To "desire" something is to want that thing. To "enhance" something is to make that thing better.

To "agitate" something means to disturb or to unsettle. To feel "agitated" means to feel unsettled, to feel anxious. To provide further help, "condemn" means express disapproval of, denounce; "retract" means take back, as in to take back a statement; "permit" means allow. 

"Subject to" means "cause or force to undergo (a particular experience of form of treatment)." So, we need to pick out a verb that means something like "cause or force to undergo something." While someone might teach a certain subject, "teach" does not mean the same thing as "subject to," and considering how someone might "teach a subject" uses "subject" as a noun, not a verb. "Put through," however, is close in meaning to "cause or force to undergo," and because "put through" is the answer choice closest in meaning to "subject to," "put through" is the correct answer.

"Abound" means to be plentiful. For example, one might write, “In the springtime, my garden abounds with flowers.” To further help you, "nostalgic" means feeling fondness for the past.

“Merit” describes something of value that deserves respect and admiration. “Merit” can also mean proven ability or something earned. To provide further guidance, "protect" means defend, look after; "malcontent" means dissatisfied, no content; "satisfied" means content and happy.

“Avert” means to turn something away, to prevent something bad from happening. To provide further guidance, "succinct" means clearly expressed in as few words as possible; "contend" means argue for, compete.

An “anchor” is something you use to keep a boat at one location in the water. When used as a verb, however, “anchor” means hold onto or secure. None of the other answer choices are close in meaning to "anchor": "demean" means put someone down or embarrass someone; "allege" means claim or assert; and "depict" and "portray" are synonyms that each mean show or represent.

"Instigate" means start, cause, or set off. Therefore, "cause" is the synonym.