The proletariat were
a. the wealthy middle class.
b. the owners of the means of production.
c. the workers.
d. the unionized workers.

Option C.

Explanation:

The workers, is the right answer.

The term proletariat is used to refer to the class of wage-earners in an economic community whose only property of important material cost is their labor-power. Any person of this class may be called as the proletarian. In the Ancient Roman Empire, the proletariat was made up of the poor landless freemen. In simple terms, they were the people with the lowest economic and social classes in a community.

its c not d   tell me if that´s correct

william mckinley

ulysses s. grant

benjamin harrison

by the way what grade r u in k12?