Karl Marx explained the process of class struggle with the help of Dialectical Materialism.

• Dialectical materialism is a philosophical and sociological theory that emphasizes the role of social conflict in historical change.
• It argues that history progresses through a series of clashes between opposing forces, such as the ruling class and the working class.
• Marx believed that these conflicts would ultimately lead to a socialist revolution and a classless society.

The other options are not as relevant to Marx's theory of class struggle

• Empirical Liberalism focuses on individual rights and freedoms, not class conflict.
• Existentialism is a philosophical movement that emphasizes individual freedom and responsibility.
• Darwin's theory of evolution explains the development of species through natural selection, not social change.