Final answer:
The narrator received a letter from Roderick Usher while he was recovering from sickness. Option D.
Step-by-step explanation:
The narrator received a letter from Roderick Usher while he was recovering from sickness. In the story, the narrator describes receiving a letter from Roderick Usher, in which Roderick expresses his desire to see him and seeks his company to alleviate his mental and physical distress. This letter prompts the narrator to visit Roderick Usher at his mansion and play a significant role in the events that follow. If the narrator received the letter from Roderick Usher while he was recovering from sickness, the appropriate choice would be (D). This would suggest that the letter played a role during a period of the narrator's illness and might have influenced the unfolding events in the story.