Read the following selection from the text.
Now this is the point. You fancy me mad. Madmen know nothing. But you should have seen me.
You should have seen how wisely I proceeded-with what caution with what foresight - with
what dissimulation I went to work! I was never kinder to the old man than during the whole week
before I killed him. And every night, about midnight, I turned the latch of his door and opened it -
oh so gently!
How does the selection contribute to the development of the narrator's state of mind?
(A)
It summarizes the problems the narrator experienced before the murder.
(B)
It reveals how the old man's and the narrator's relationship changed over time.
It emphasizes the narrator's insanity through his insistence on the opposite idea.
It introduces the idea that the old man's actions caused the narrator's reaction.
(C)
(D)