Why is the caste system a central part of the hindu religion? a. there are different hindu gods for each caste level. b. it is a carryover from hinduism’s roots in the aryan migration. c. it correlates to differing levels of spirituality. d. hinduism states that actions are judged according to caste level.

The answer would be B. it is a carryover from Hinduism's roots in the Aryan migration. More specifically, it is a continuation of the Vedic caste tradition, which believed that specific people occupy specific levels in society from which they cannot move.

Answer;
B. It is a carryover from Hinduism’s roots in the Aryan migration

The caste system that is central part of the Hindu religion  is that it is a carryover from Hinduism's roots in the Aryan migration. 

Explanation; 
A caste system is a system that assigns groups of people by birth to follow certain regulations and divides them to a hierarchy where certain groups of people are privileged than others.
The system is deep rooted in South Asian society having Hindu or similar religions mostly in India.

high entry costs prevent new producers from entering the market.

explanation:

an oligopoly is a term used to clarify the structure of a particular market, industry, or organization. a market is considered oligopolistic or amazingly focused when it is shared between a few companies.