Passage from chapter 3 beginning with "Reading over what I have written" and ending with "The incident and the name had remained together in my mind": http://crossref-it.info/text/the-great-gatsby/chapter-3#contents
It is clear from this passage that the narrator:
A) believes his experiences to be unimportant
B) has disdain from the "young clerks"
C) resists revealing his own emotions
D) is an astute observer of humanity
E) is not bothered by the reactions of others