What does Nick mean when he says, “I see now that this has been a story of the West, after all”?

Nick realizes that the East is connected with a fast-paced lifestyle, immoral parties, and bad moral values, while the West is associated with a more traditional moral system. Nick then decides to move back to the West.

a dictionary is the correct answer

i would believe it would be b., the author wants to draw the reader deeper into the experience