Answer:
C. That she is beginning to go insane
Step-by-step explanation:
In "The Yellow Wallpaper," the narrator's obsession with the wallpaper can be seen as a manifestation of her own mental breakdown, and her increasing fixation on the wallpaper represents her descent into madness. The more she becomes obsessed with the pattern of the wallpaper, the more she begins to see hallucinations and to lose touch with reality. This ultimately leads to her breakdown and descent into madness.
Therefore, the reader can learn about the narrator's deteriorating mental state from her obsession with the wallpaper in the story.