The accurate statement that compares the social structures of Egypt and Mesopotamia is:
Priests and priestesses were closer to the pharaoh in ancient Egypt.
In ancient Egypt, priests and priestesses held significant power and influence, often serving as intermediaries between the gods and the pharaoh. This was not necessarily the case in Mesopotamia, where the role of priests varied and did not have the same level of direct connection to political power as in Egypt. The other statements regarding enslaved people, scribes, and merchants are inaccurate in their representations of social classes in both cultures.