Final answer:
The narrator in 'The Tell-Tale Heart' is unreliable due to contradictory statements and erratic behavior.
Step-by-step explanation:
The passage from Edgar Allan Poe's 'The Tell-Tale Heart' indicates that the narrator is unreliable through his contradictory statements and erratic behavior. While he claims to be intelligent and calm, his actions and words suggest otherwise. For example, he insists on his acute sense of hearing, but also refuses to listen to anyone else's version of the story. These inconsistencies and irrational behavior are indicators of an unreliable narrator.