Answer: C. to help readers understand the condition of the narrator
Explanation: Charlotte Perkins Gilman uses the first-person narration in her short story "The Yellow Wallpaper" to help readers understand the condition of the narrator. The narrator is a woman with a mental illness. Her husband, a physician, says she suffers from a temporary mental depression and treats her accordingly. He does not pay attention to his wife's pleas that she suffers from a more serious illness.