The economies of the former soviet union, eastern europe, and china prior to market reforms faced problems caused by lack of coordination and lack of

As the coordination problems faced by the economies of the former Soviet Union, eastern Europe, and China preceding to market reforms became harder as the economies expanded and as markets also became more complex which led to lack of incentives.

lack of incentives

the answer is b: the religion they practice.

here's why:

there were many different native american tribes and those with similar characteristics formed a main tribe or nation. each had its own language, religion and customs.

i believe it would be capitalism