Answer:
B). Skeptical of Usher's theory.
Step-by-step explanation:
In the given excerpt from 'The Fall of the House of Usher', Poe seems 'skeptical of Usher's theory' which is clearly reflected through his non-supportive attitude(reflected by the phrases like 'the evidence...was to be seen, he said') instead of himself supporting or justifying the claim. The constant repetition of phrases like 'he said' or 'he added' clearly reveals that the author is suspicious about the claim made regarding this theory. This dubiousness is justified when the author denies commenting upon this('Such opinions need no comment...'I'll make none'). Thus, option B is the correct answer