What was the role of cities in the early civilizations?

Cities were at the center of all early civilizations. People from surrounding areas came to cities to live, work, and trade. ... Cities concentrated political, religious, and social institutions that were previously spread across many smaller, separate communities, which contributed to the development of states.

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.

4 is the oni could think of