It is exclamatory
Why?-
because sentences that ends with an exclamation mark is usually an exclamatory. <span />
I’d say:
I had a hard time deciding whether to write an essay about the works of “Eudora Welty, Joan Didion, Gwendolyn Brooks” because the rest of the punctuations doesn’t make sense.
But actually it should be:
I had a hard time deciding whether to write an essay about the works of Eudora Welty, Joan Didion, and Gwendolyn Brooks.
(Without the quotation marks and inclusion the word “and” before “Gwendolyn”)
As an English speaker the advice i give to someone who wants to learn English would be it does take time but it's actually not that hard to learn English you just need to keep practicing and try to talk with the words you know so you can get used to it.
Some prefixes are pre, post