Rhetoric the art of effective or persuasive speaking or writing, especially the use of figures of speech and other compositional techniques.
So it would be A
I would think it would be simple but it might be compound. Hope this helps somewhat
The right answer is "A. The clergy "
You should be referring to the quote from "The Canterbury Tales" where the word gold is used to represent the clergy in all its purity that leaves it in such a high standard that nothing can reach it, just as gold can not be attained by rust.