Answer:
The aspect of the room that seems to most bother the narrator of "The Yellow Wallpaper" is, in fact, the color and the pattern it has.
Explanation:
The narrator of this story is a woman who is married to a well known and respectable psychologist who had diagnosed her with depression, she is supposed to be in this room with the yellow wallpaper to recover from her illness but the more time she spends in there the bigger her illness becomes and she talks about how annoying the stories and faces that come from the wallpaper are.
