Final answer:
The best summary is that Mao Zedong identified the landlords as the principal adversaries in the Chinese revolution due to lack of an industrial working class, and thereby extended the concept of the revolutionary class to include peasants, intellectuals, and others who were oppressed by landlords and imperialists.
Step-by-step explanation:
The statement that best summarizes the quotation 'The biggest enemies of the revolution are the landlords' is related to Mao Zedong's approach to revolution in China. Unlike Russia or other industrialized nations, China did not have a significant organized working class or proletariat to support the Communist revolution. Therefore, Mao extended his call to the peasantry, intellectuals, and the petty bourgeoisie who were oppressed by the landlord class and the Japanese imperialists, positioning the peasants' struggle against the landlords as a central focus of the revolution. Mao's strategy for communism, which diverged from traditional Marxism that centered on the proletariat, also involved calling upon the bourgeoisie who shared his nationalist and anti-imperialist views. Through land reform and other policies, Mao targeted the landlords to redistribute land to the peasants, galvanizing their support for the revolutionary class and the spread of Marxism.