The imagery that Poe uses to help you hear, see, smell, and feel the sensations of being buried alive is like I could feel myself gasping for air as he described this scene to me. I could see myself in the middle of tons of dirt, smelling the dust. I could hear the dirt getting piled on top of me.
The answer would be D) External conflict because its a battle between one character and another so this is just like an ex of Batman vs The Joker, both of them are characters and they are in a fight against each other and this is a external conflict since its a character vs character thing, its not exposition, its not internal conflict because that's a problem in the inside like what should I do, and not resolution because that's like the solution to a problem.
I think the answer would be the second option :)