Answer: C.
Explanation: C. to serve as temples for the city's god or goddess.
What was and main features of the ziggurats
The ziggurat was a kind of temple built by the Assyrians, Babylonians and Sumerians, people of ancient Mesopotamia.
This building had the shape of a pyramid, but with the presence of species of steps.
The ziggurats had 3 to 6 floors. They were made of stone or sun-baked brick.
The entrance was through the top of the temple, with access through a spiral ramp, built into the outer walls of the ziggurat.
Their religious function was very important, as the ancient Mesopotamians believed that the Ziggurats served as a dwelling place for the gods.
Through these constructions, they believed that the gods would be closer to society. Therefore, only the priests could access the inner parts of the ziggurat.