When did the first cities develop in mesopotamia? a. about 12,000 years ago c. around 6000 bc b. around 8000 bc d. between 3000 bc and 4000 bc

The correct answer is D. between 3000 BC and 4000 BC.
This was the time when the first cities developed in Mesopotamia, mostly as the result of the actions made by the Sumerian people. After that, writing is developed, the leaders of Mesopotamia started conquering other nations, and overall, the empire began its development.