Which one of the following works was not written by Karl Marx?

Correct option is E

All of the works listed were indeed written by Karl Marx. "Critique of the Gotha Programme" is a critique of the draft program of the United Workers' Party of Germany. "The Communist Manifesto," co-authored with Friedrich Engels, is one of Marx's most famous works, outlining the principles of Marxism. "Das Kapital" is Marx's critical analysis of capitalism. Each of these works significantly contributed to the development and understanding of Marxist theory.