Who or what is the antagonist in "the yellow wallpaper"? a) the narrator's husband b) the narrator's obsession with the yellow wallpaper c) the narrator's sister-in-law d) all of these e) none of these

I would say that the antagonist is A) the narrator's husband.

John seems to be her primary obstacle because he always interfered with her desires and decisions. What is more, he tells the narrator what to do, like where to sleep, what medicine she should take, etc. He might represent the patriarchal society. 

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