The statement that is a theme of "The Yellow Wallpaper" is people need to be mentally active and engaged to keep their sanity.
The yellow wallpaper is a story of a women's mental health, who is living with her family, in a rest cure. She is obsessed with a yellow wallpaper in her bedroom because she is depressed.
Thus, the correct option is A. People need to be mentally active and engaged to keep their sanity.
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