Narrative structure is C), the way in which a story is organized.
The answer is monster, as the text itself even compares it to a monster.
"The USS Alabama, built in 1942, is a monster weighing in at 35,000 tons."
Here is a website for meaningful poems. I think you can find a good one on here. I couldn't really find a clean meaningful rap song so I tried to find a poem, but I don't know what kind of thing you like so here you go, https://classicalpoets.org/2016/01/07/10-greatest-poems-ever-written/