Answer: a) Social Classes only exist under capitalism
Step-by-step explanation:
The introduction of capitalism has brought a wide gap between the Rich and poor so the introduction of capitalism has made the rich get richer and poor poorer therefore making social classes to exist in any society. Karl Marx being socialist has been advocating for a socialist economy, hence, his ideology of perfect economy to bridge the existing gap of the poor and the rich to create a middle class and reduce the level of poverty in any society.