Answer: The right answer is the D) Wallace uses dialogue to show the conflict that can occur between inner perceptions of self and outside perceptions of self.
Explanation: Just to elaborate a little on the answer, it can be added that in this extract from Wallace's famous novel, Infinite Jest, the author is primarily using dialogue in order to show the conflict that can occur when an inner perception of yourself differs from the perceptions that others have of you. The dialogue here, however, takes the form of a soliloquy, since the character is the only one talking. The character is voicing out loud what he seems to be thinking, in an attempt to defend himself from an alleged accusation - "I am not just a jock," "The grades are mine," "I cannot make myself understood." The use of direct speech makes the text more vivid. The author is using neither objective facts nor characters' actions, so options A and B should be discarded. He is not using descriptions either, so option C should be discarded too.