Why did Gilman most likely choose an unreliable narrator to tell the story of "The Yellow Wallpaper"?

The narrator’s account becomes increasingly disjointed as her mental health worsens, so readers can see that her husband’s treatment and isolation are not helping her. Her unreliable narration reveals the gap between what John believes is happening and what she is experiencing. The best answer is D, because it helps readers understand that she is not getting the help she needs.

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