Answer:
i think it's either C or D but most likely D
Explanation:
not mine :
The narrator tries to convince the readers he is not "mad"; however, the more he tells us, the crazier we realize he is (although he thinks he is sane, the readers understand he is not).When the narrator is being extremely nice to the old man right before he kills him, asking him how he is doing, etc.
hope that helped <3