Correct Option: D

The caste system is a system of division of labour and power in human society. It is a system of social stratification, and a basis for affirmative action. Historically, it defined communities into thousands of endogamous hereditary groups called Jatis. The Jatis were grouped by the Brahmanical texts under the four well-known caste categories (the varnas): viz Brahmins, Kshatriyas, Vaishyas, and Shudras.