C)The narrator says he is not mad, but he claims he can hear all the sounds on heaven and earth.
Explanation:
An unreliable narrator is a narrator, whether in literature, film, or theater, whose credibility has been seriously compromised. In the case of the above excerpt, the narrator says that he is not crazy, but soon he says that he can hear all the sounds of the sky and earth (besides being very nervous) and this is not normal for a person who is not crazy, for this reason the narrator's credibility is compromised which makes him an unreliable narrator.
