Read the following sentence from “The Fall of the House of Usher,” in which the narrator explains that he has received a letter from Roderick Usher. A letter, however, had lately reached me in a distant part of the country—a letter from him—which, in its wildly importunate nature, had admitted of no other than a personal reply.

What is the most likely reason the narrator says the letter "admitted of no other than a personal reply"? Base your answer on your knowledge of the story as well as on the sentence.

A. The narrator feels obliged to respond to his friend's request for a visit because his friend is clearly upset.
B. The narrator is worried that it will seem rude if he does not answer the letter in a personal way.
C. The narrator hopes his friend will invite him to stay in the distant part of the country where his friend lives.
D. The narrator believes that his friend is threatening to harm him if he does not give the right answer.