The correct answer is:
A. China lacked a proletariat
Explanation:
Both the Russian and the Chinese Revolutions were focused on installing and spreading Communism after the end of a World War (Russia after World War I, and China after World War II) and on ending the social inequality created by a big gap between society. Lenin and Mao were inspired by Marx's theories of Communism but the focus they used was different because Russia had a big proletariat, also known as working class population and China had a big population of peasants who worked on agriculture.