Which element in "the yellow wallpaper" the reader better understand that the narrator is slowly losing her mind ?
a. her pleas to visit with friends
b. her attempts at hiding her writing
c. her obsession with the wallpaper
d. her requests to change bedrooms

The correct answer is:

C. Her obsession with the wallpaper

The idea is that the reader catches a persepctive that the narrator is slowly sinking into madness.  Is there really a woman creeping around outside in the bushes? Probably not. Is there really a woman trapped in the wallpaper? Definitely not. But is the pattern of the wallpaper interesting and confusing? Probably yes.

alone =having no one else present.

it u understand what he thought at the time and let u know more about him then what third person would of known probably. hope this : )