Read the excerpt from "the tell-tale heart.” true! —nervous—very, very dreadfully nervous i had been and am; but why will you say that i am mad? the disease had sharpened my senses—not destroyed—not dulled them. above all was the sense of hearing acute. i heard all things in the heaven and in the earth. i heard many things in hell. how, then, am i mad? hearken! and observe how healthily—how calmly i can tell you the whole story. which statement best explains how the reader can determine that the narrator of this passage is unreliable?
a the narrator is very calm as he begins to relate all of the events of the story.
b the narrator worries that his dreadful nervousness has caused him to go mad.
c the narrator says he is not mad, but he claims he can hear all the sounds on heaven and earth.
d the narrator has sharpened senses that allow him to hear sounds that others cannot.