Question

read the excerpt from poes the fall of the house of usher.
it was, perhaps, the narrow limits to which he thus confined himself upon the guitar, which gave birth, in great measure, to the fantastic character of his performances.
what does this excerpt reveal about the narrator of the story?
it describes what the narrator knows from his past.
it describes what the narrator experiences.
it provides an inference drawn by the narrator.
it provides a criticism voiced by the narrator.

Explanation:

The narrator is making an assumption ("it was, perhaps") about the cause of Usher's performance style. This is an inference, not a description of past knowledge, an experience, or a criticism.

Answer:

It provides an inference drawn by the narrator.