In India, a system of stratification persists, partially because it was exploited by British colonialism to persistently divide the people. This division of society into four main groups (Brahman, Kshatriya, Vaishya, and Shudra) is an example of:.

A caste system, is the right answer.

Explanation:

A social category to which an individual belongs involuntarily is known as the Caste System. It is a system of social stratification. In the context of India, a Sanskrit word Varna was used to refer to the social classes. There were four main Varnas in Indian society, i.e. Brahman, Kshatriya, Vaishya, and Shudra. The Varna of people was determined by birth.