Choice A is false because the events or people are real.
Choice B is true (the people and events are real), but it's not the reason why the writer would go for a poem. The writer could go for an essay if all they wanted to do was talk about the person or event.
Choice C is true and it's the answer. Poems provide an emotional response of some kind which allows people to connect better. This in turn allows people to remember the poem better, or remember the person/events better.
A narrative essay is an essay that tells a story, usually about one's life, or part of one's life. Many times narrative essays are anecdotal or personal.
