All of the above why wouldn’t it be
A. Words are used whose sound imitates the sound of the thing being named
The correct statement is option B) “some words that are usually nouns can function as adjectives”. Sometimes nouns can function as adjectives depending on their placement within the sentence
Option A is incorrect since adjectives cannot modify adverbs.
Option C is also incorrect since an adjective only modifies nouns
Option D is also incorrect since adverbs do not modify nouns. Adverbs modify an adjective, a verb, a clause, and another adverb.
I think that the dystopian setting gives the characters an authenticity that they might not have had in another context.