The false answer is A) Nomadism.
"The Sumerians adopted the agricultural mode of life which had been introduced into Lower Mesopotamia and practiced the same irrigation techniques as those used in Egypt...irrigation development was associated with urbanization,and...89% of the population lived in the cities."
"Like other cities of Asia Minor and the Mediterranean, Sumer was a polytheistic, or henotheistic, society. Their lives were spent serving the gods in the form of man-made statues. There was no organized set of gods; each city-state had its own patrons, temples, and priest-kings."
"Beneath the lu-gal ("great man" or king), all members of society belonged to one of two basic strata: The "lu" or free person, and the slave (male, arad; female geme)."
