In Mesopotamia, How Did the Climate Promote the Development of Central

In Mesopotamia, how did the climate promote the development of central authority?

A) The tropical environment required coordinated communal work to clear forests for agriculture.
B) The monsoon season required a central authority to build and maintain pontoon bridges and boats that could move quickly to high ground.
C) The extreme summer temperatures required the establishment of public baths to provide relief from the heat.
D) The arid climate required large-scale irrigation projects directed by a central authority.