How did food surpluses help ancient societies develop?

Humans have survived and thrived in mexico city by using technology to create greater access to land. when the spanish conquered the aztec capital, tenochtitlan, in the 16th century, they built mexico city by draining the lakes and filling in the lake water to create more arable land for agriculture. this technique of land reclamation has continued to be fundamental to human civilization in mexico city. 

The answer is filtering so c

Ibelieve the answer would be a large-scale natural disaster 

Ithink this answer here is a or d