The correct option is C Classless society
Communism aims to create a system where all the private property is owned by the community where an individual contributes or receives according to their ability and needs. Marxist communism written by Karl Marx and Friedrich Engels have been the adopted ideology for communist movement. To achieve the idea of utopian state, Marx called for the armed revolution of the proletariat against bourgeoisie to seize means of production, police, courts, prison. Proletariat will rule in it's own class interest and eventually interim state will wither away leaving a classless communist society. So, options A,B and D are means for achieving communism, whereas ultimate aim is a classless society. Hence, C is correct answer.