Final answer:
The two themes established through Fitzgerald's literary elements are the decay of the American Dream (option A) and the moral decay of 1920s society, represented through the eyes of Dr. T.J. Eckleburg (option B) and the characters of George Wilson and Tom Buchanan.
Step-by-step explanation:
Through the description of the setting, symbolism, and characterization in Fitzgerald's works, particularly in The Great Gatsby, two emerging themes are established: the decay of the American Dream and the moral decay of society during the 1920s. Specifically, the eyes of Dr. T.J. Eckleburg symbolize the omniscient watch over a society in decline, reflecting Theme B: Dr. T.J. Eckleburg's eyes were watching the slow moral decay of Americans during the 1920s. Additionally, the contrasting characters of George Wilson and Tom Buchanan exemplify the disparity in wealth and status, as well as their respective adherence to and deviation from moral norms, aligning with Theme A: Many 1920s Americans' dreams were like heaps of ashes clinging onto them as they slowly watched them fade.