Which of these best describes the effect the author of "The Yellow Wallpaper" achieves by allowing the narrator to tell her own story?

The reader comes to believe that the wallpaper pattern really is threatening the narrator.
The reader is able to judge for him or herself whether the wallpaper is really "alive."
The reader participates in the deterioration of the narrator's condition.
The reader is better able to sympathize with what John and Jennie are dealing with.