This is from the great correct answer only !

what irony does nick notice at gatsby's party?

a. although the party is rowdy and most people are drunk, gatsby is reserved and never drinks alcohol.

b. although many people are gossiping about him, gatsby brags about the great number of close friends he has.

c. although his house is huge and opulent, gatsby laments that his house is too small for him.

d. all of his guests are wealthy and/or famous, but gatsby has done nothing remarkable in his life.