What Prediction Did Karl Marx Make with His Theory About

What prediction did Karl Marx make with his theory about social stratification in capitalist societies?

A) Emergence of an exploited working class consciousness would result in a revolution.
B) Class conflict would occur between the bourgeoisie and the petite bourgeoisie.
C) Over time,the capitalist mode of production would produce income equality.
D) Surplus value was created by workers in feudalism but not in capitalism.