Explanation:

- Option 1: Cuber

- Cuber is lesser-known in the context of social stratification and more in the realm of sociology related to marital roles and family structures.

- Option 2: Raymond Murray

- Raymond Murray is associated with criminology. He's not particularly noted for significant contributions to the theory of social stratification.

- Option 3: Sorokin

- Pitirim Sorokin was a sociologist who extensively studied social stratification and mobility. He proposed theories about how society is layered into distinct classes.

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- Option 4: Herbert Spencer

- Spencer was a key figure in social Darwinism, focusing on the evolution of societies and concepts of "survival of the fittest," rather than specific class stratification.

The statement in question aligns best with Sorokin's recognized work in the area of social stratification.