Answer: B) through military campaigns and Alliances, he unified Mesopotamia under one ruler.
Explanation:
because the king Hammurabi and the king of Mesopotamia decided had diplomatic contacts and cooperate in certain matters. this cooperation was a wise move for the king of Mesopotamia in order to gain allies in his continues wars. this king was willing to work with Hammurabi and render him small favors, and in return, the king of Mesopotamia asked for Hammurabi's help with certain difficulties.