<span>The region became an area of tension and unrest. (the </span> answer is A .)
Its because science came to be that it relied on big projects. I hope I could help! :D
Villages and towns were built around ubaid farming communities. They are known as Sumerians. They were in control of the area by 3000 B.C. Their culture was comprised of a group of city-states.
I believe its B but i might be wrong IDK