What does this excerpt from the end of "the yellow wallpaper" tell the reader about the narrator's mental shift?

i suppose i shall have to get back behind the pattern when it comes night, and that is hard!

a. the narrator believes the window bars will not allow her to escape.
b. the narrator believes the woman in the wallpaper will attack her while she sleeps.
c. the narrator believes that she was once behind the wallpaper herself.
d. the narrator believes the wallpaper is beautiful, and she wants to take some home.