Which statement best describes the sumerian city-states?
a. each had a written code of laws.
b. each was located on the tigris river.
c. each was located in the mountains.
d. each had its own government.

The correct option is D.
The Sumerian city state is made up of 12 large cities, which were governed separately by different rulers and each had its own government. The people of Sumerian are among the earliest civilized people, they organized themselves into different city states that were independent of one another. The cities are located at the southern side of Mesopotamia. 

The statement that best describes the Sumerian city-states is "Each had its own government." Option D is correct.

The Summerian ciry states are considered the first cities in the world. Among the most important, were Eridu, Uruk, Ur, Larsa, Isin, Adab, Kullah, Lagash, Nippur, and Kish. The city of Uruk is held to be the first true city in the world.

Sumer is the earliest civilization in the historical region of southern Mesopotamia, modern-day southern Iraq, during the Chalcolithic and Early Bronze ages.

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