The answer is B. It recreates the experience for the audience which is kind of the whole point of doing a narrative.
The answer is A. if the essay was suppose to be descriptive then the description or what was being described should have made the reader felt as though they were experiencing it themselves.
I did one once about the Holocaust. I talked about how the Jews survived and the Nazis failed to succeed. In the poem, I related the Nazis to a storm and the Jews to people on a wooden ship out at sea.
Hope this gives you any ideas!
Whats the question exactly?