A, because it says the year
Fitzgerald wants to portray and characterize the US society in the 30s. By making this question about race and their opinion about it, the author intends to characterize American society as competitive, a value that is repeated throughout the story. One of the main purpose of the novel, in fact, is to show how competitive, materialistic, and full of glamour the society is, especially the people who live in East Egg like Tom and Daisy.
