Initially the central symbol of religion, the main temple, was also considered the main residence of the government as well as the center of economic life. The Sumerian royalty was under the priesthood and had to answer to them. Later on, the kings went out far and wide on different conquests to different lands, building kingdoms and slowly getting power.
Now, the religious places and the priests became lower than the royalty. However, both the Sumerian kings and the government were connected as the Sumerian civilization believed that the kings got their stunning powers as a direct gift from the god.
The correct answer to this question is C. Chinampas are Mesoamerican agriculture which needed tiny rectangular areas of land in order to grow crops near the lake in Mexico. The Aztecs used chinampas, which are floating gardens, to grow their vegetables.
They're smart people because that great idea helped them to use the area out there on the lake to grow plants instead of on land, which was needed for the growing population. The ancient name for the region where these chinampas were grown was called Chinampan which was located in the region, Xochimilco. This technique is still used today.