What did Karl Marx believe his version of communism could do for society?

He saw communism as a way to end the cycle of violent unrest in society once and for all.
He predicted communism would make violent revolution a permanent part of life.
He thought communism could bring the benefits of capitalism to everyone.
He wanted communism to strengthen the power of the bourgeoisie.

A is correct.

Explanation: this attitude makes him a humanist. He did not commit any crime (I believe), but he (as many others before him) did not evaluate sufficiently human nature. He believed that humans are better that they are and that is why he believed that they would be able to make "perfect society". Marx died in the 1880s and did not witness times when Communism entered into existence not as a theory, philosophy, doctrine but as regime. He did not witness the way how people put it into existence ...he was a pure theorist.

i believe its the indians

the term is einsatzgruppen