Why was FDR unhappy with the Supreme Court

Answer is C) Chinese communism pushed the idea that rural peasants were the force behind revolution.

Chinese communism, especially in its earliest days, pushed the idea of rural peasants forming the backbone of the revolution. This differed from European communism, exemplified by the USSR, which put a greater focus on urban workers. European communism generally put a larger emphasis on industry than Chinese communism in the early years of Mao.

It is important to note that not only this feature of Chinese communism, but the general ideas of Chinese Socialism, evolved and changed quickly over time, and this idea is almost irrelevant in the Chinese Communism of today.