Answer:
A
Explanation:
Okay the answer is A for a variety of reasons for one we can cross off most of these answers, b is incorrect since the development of empires created complex social hierarchy. Next D, most people were nomadic and didn't fight large scale wars that definitely changed and especially in mesopotamia the fighting was constant, sargon came in then the gutians then the amorites must I go on? And finally c, now this is a viable answer because some stopped focusing on mainly agriculture for other things like making their cities nicer, however some civilizations still had a ton of food like egypt or the indus valley. So sumerian culture spread like wildfire because of trade, much like Buddhism traveled the silk road. people began trading a lot as far as India and China. And even later sumerian culture influenced Babylon, the akadians, the gutians etc. so that's why a is the most viable answer, but you're welcome to draw you're own conclusions
