The irony in the given sentence from the Tell-Tale Heart is Dramatic irony. Thus, option C is correct.
An irony is given as the contrast appearance of the situation that it was actually happening. The irony adds the sense of sarcasm to the text and can be used as the literary device.
In the given sentence from the Tell-Tale Heart, there was depicted that the audience was known about the main character, while the characters in the play are unaware about that. This type of irony is known as the Dramatic irony. Thus, option C is correct.
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