The Olmecs were descendants from

Europe
Africa
Asia
North America

Africa

Explanation:

While historians have speculated that the facial features of some monumental carved heads indicate an African origin of these people, most scholars believe that the Olmec, like other native Americans, descended from Asian ancestors who entered North America during the Great Ice Age

a social contract.

"a social contract is an agreement between citizens and their leader where the citizens give up certain freedoms in exchange for protection. the constitution of the united states is an example of a social contract."

determination