Question

Erik Wright developed a four-class model to portray the social classes based on the work of Karl Marx. The first is

Answer 1

The four classes that Erik Wright identifies, based on the work of Karl Marx are: the capitalists, the Petty bourgeois, the managers and the workers.
So I assume that the first class that your question is asking for is the capitalists.

(some other scholars also identify other classes: the underclass and the working poor)