A person's caste in Indian society was determined by

a. education

b. personal characteristics

c. birth

d. achievement

birth and education

Explanation:

In ancient India, everyone was assigned to the Shudra varna by birth. Then the education obtained by them, determined their caste. That is why Bramhan, Kshatriya, Vaishya - all were known as twice-born.

you know I'm Indian!

Birth and education

Explanation:

Indians case was determined from birth especially from the mother and the education how much he presents himself properly.