Question

read this excerpt from infinite jest.
my applications not bought, i am telling them, calling into the darkness of the red cave that opens out before closed eyes. i am not just a boy who plays tennis. i have an intricate history. experiences and feelings. im complex.
i read, i say. i study and read. i bet ive read everything youve read. dont think i havent. i consume libraries. i wear out spines and rom - drives. i do things like get in a taxi and say, \the library, and step on it.\ my instincts concerning syntax and mechanics are better than your own, i can tell, with due respect.
what assumption does the narrator make in this excerpt?
that the people he is addressing enjoy long conversations
that the people he is addressing underestimate him
that the people he is addressing have researched philosophy
that the people he is addressing expect a confrontation

Explanation:

The narrator says "My application's not bought" and "I am not just a boy who plays tennis" which implies that he thinks the people he is addressing see him only in a limited way (as just a tennis - playing boy), i.e., they underestimate him. He also says "Don't think I haven't" in relation to reading, further indicating that he believes they have a low - opinion (underestimate) of his intellectual capabilities.

Answer:

that the people he is addressing underestimate him