Before the formation of city states, Mesopotamians were nomadic tribes who moved around following the herds of animals. They survived off the land and the wild grains and other things they could find. Essentially, they were like the European Native Americans.
The best and most correct answer among the choices provided by your question is the first choice or letter A. Promotion of trade throughout Asia was one of the policies implemented by Genghis Khan.
<span>Genghis Khan, born Temüjin, was the founder and Great Khan of the Mongol Empire, which became the largest contiguous empire in history after his death.</span>
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