Sumerian cities were characterized by what? brick streets, sewer systems, and homes made of stone some narrow, unpaved streets, protective walls, and homes made of mud-bricks hilly roads, sewer systems, and homes made of adobe canals, protective walls, and homes made of wood

Homes made of stone some narrow, unpaved streets, protective walls and homes made of mud-bricks hilly roads

Explanation:

The people in the area called Sumer or Sumerians were said to be from the southern part of Mesopotamia. The civilization they had at that time boomed between the 4100-1750 BCE.

Some of the great inventions and concepts people often take for granted today came from Sumerians. The invented time by systematically dividing the night and day into two distinct periods of 12 hours each.

The name Summers mean the land of civilized kings and their cities were seen to have narrow unpaved streets, with well-guided walls. Their homes had mud bricks and wood.  

i think your answer there is c