Answer:
D. That she is slowly losing her mind
Step-by-step explanation:
In "The Yellow Wallpaper," by Charlotte Perkins Gilman, the narrator's changing perception of the wallpaper helps the reader understand that she is slowly losing her mind.
This is because, in the book, the narrator is obsessed with the yellow wallpaper in her bedroom as she tries to cope with depression, however she starts to lose her mind in the process.