How did religious structures encourage the growth of early cities?

a.
religious structures created a more urban environment, which lessened the need for agriculture and promoted the development of cities.
b.
religious structures drew people into the city, encouraging growth because people wanted to live near temples, monuments, and religious sites.
c.
religious structures encouraged travel to early cities, but ultimately the land needed for agriculture prevented widespread growth, keeping early cities quite small.
d.
early civilizations were extremely religious, and structures were built for ceremonies and to worship the gods.