The correct answer is option 4: Theory of New Democracy.

Option 1: Dialectical Materialism is a theory developed by Karl Marx that is the basis of historical materialism. It emphasizes the role of contradictions and conflicts in driving historical change.

Option 2: Historical Materialism is a theory developed by Karl Marx which argues that the material conditions of society, such as the means of production and the mode of production, determine the social and political structure.

Option 3: Class Struggle is a central concept in Karl Marx`s theory of communism. According to Marx, society is divided into two opposing classes, the bourgeoisie (the ruling class) and the proletariat (the exploited working class). Class struggle refers to the conflict and tension between these classes, which Marx believed would eventually lead to the overthrow of the bourgeoisie and the establishment of a communist society.

Option 4: Theory of New Democracy is not a doctrine of Karl Marx. It is a theory associated with Mao Zedong, the leader of the Chinese Communist Party, who adapted Marxist theory to fit the conditions of Chinese society. The Theory of New Democracy focused on the relationship between the proletariat and the bourgeoisie in the context of a semi-feudal and semi-colonial society, advocating for a united front