Answer:
A. Each person in society had specific duties based on their caste.
Explanation:
The indian civilization that grew around the indian river had a very specific division among people based on their caste and that gave them an specific job and the specific duties that people would have to perform, this division of the work and the different works shaped the way indian society lived,it was not allowed for people to move in the social pyramid, and that kept them forever in the same place/job for the rest of their lifes.
