1) Find the object of the preposition.
2) Ask yourself which other word in the sentence is related to this noun or pronoun by the preposition.
Answer:
D, budget. The others did not make sense.
Add on:
sorry if its incorrect/hope this was useful to you.
Answer:
"This definition of prose is an example of prose writing, as is most human conversation, textbooks, lectures, novels, short stories, fairy tales, newspaper articles, and essays."
That looks hard good luck!