Answer: C. Roderick Usher is struggling both mentally and physically
Explanation: In "The Fall of the House of Usher", by Edgar Allan Poe, what the reader can infer to be true of Roderick Usher's character based on how his letter to the narrator is described is that he is struggling both mentally and physically. The narrator is arriving at the House of Usher. He was summoned there by Roderick Usher, a school-friend of his. In the letter, Usher told the narrator that he has not been feeling well both physically and mentally and that he needs the narrator's presence to keep him company.