The Marxist Critique of Capitalism Was Based on the Notion

The Marxist critique of capitalism was based on the notion that:

A) a capitalist system ignored traditional class roles.
B) efficient allocation of resources was not a worthwhile goal.
C) the proletariat class exploited the capitalist class, which created all the value inherent in goods.
D) the capitalist class exploited the proletariat class, which created all the value inherent in goods.