The correct answer is equal economically and socially.
A communist system is one in which the government would own property, the means of productions, and all goods within a socieety. From there, the government would decide how to distribute these goods to the citizens. This would result in the destruction of social and economic classes. This means that all citizens would be equal from an economic and social viewpoint. This is why the third statement is correct, as workers who want a communist government would support a system of all citizens being equal.