Which of these lines from "The Yellow Wallpaper" by Charlotte Perkins Gilman best demonstrates the unreliability of the narrator?

The right answer for the question that is being asked and shown above is that: "b. There comes John's sister. Such a dear girl as she is, and so careful of me! "

These are the following choices:

a. John laughs at me, of course, but one expects that in marriage.

b. There comes John's sister. Such a dear girl as she is, and so careful of me!

c. I can see a strange, provoking, formless sort of figure, that seems to skulk about behind that silly and conspicuous front design.

d. But I can write when she is out, and see her a long way off from these windows.

e. He is very careful and loving, and hardly lets me stir without special direction.