Answer c seems the most reasonable, but b could work as well
What book is it so I can help you?
Fitzgerald used indirect characterization by describing Gatsby's action, like when "he nearly toppled down a flight of stairs" ( Fitzgerald 91), instead of saying Gatsby was nervous. This is another way for Fitzgerald to be descriptive by describing Gatsby instead of stating what he is.
We need to see the poem in order to help you.
Sorry, best of luck.