'It emphasizes Usher's psychological fixation is the effect of parallelism in this excerpt from "The Fall of the House of Usher."
This story is narrated by a childhood friend of Roderick Usher.
The main themes of "The Fall of the House of Usher" are madness, the supernatural, and artistic purpose. Madness: The Usher family has a long history of incest, and as a result many of the current Ushers, including Roderick, suffer from insanity.
Hence, the correct answer is 'It emphasizes Usher's psychological fixation.
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