Why might emperors in asia wanted to establish a popular region?

In the Indian empires from 600 BCE to 600 CE, emperors maintained and further developed social systems that had been in place for a long time. The Aryans, nomadic herders from Central Asia who had migrated into the Indian subcontinent by 1500 BCE, had already established a caste system with four main groups of people: brahmins, or priests; kshatriyas, or warriors and aristocrats; vaishyas, or peasants and merchants; and shudras, or serfs.

This separation of people by class and job gained an even bigger foothold within Hinduism: according to Hindu myth, the god Purusha was assembled from the four castes, with the Brahmins at the head and the Shudras at the feet. It was believed that shudras had been born into their caste because they committed bad deeds in a previous life, or incarnation. The Hindu ideal of karma suggested that people who behaved well could be born into a higher casten: mark me brainliest please i need it for my rank

the answer is b. 300t + 3/2xt