Read the excerpt from poe’s "the fall of the house of usher."
his action was alternately vivacious and sullen. his voice varied rapidly from a tremulous indecision (when the animal spirits seemed utterly in abeyance) to that species of energetic concision—that leaden, self-balanced and perfectly modulate guttural utterance . . during periods of his most intense excitement.

which short story element does poe develop in the excerpt?
characterization
plot
setting
conflict