The introduction to the Declaration of Independence: (a) lists the problems that the colonies had with Great Britain (b) states that the Thirteen Colonies are free of British rule (c) says that everyone should know why the colonies are separating from Great Britain

A.

Explanation:

It states all the reasons as to why they are separating from the Britain's and lost every issue they had with British rules.

(Also B, is just what the whole document is about. And C isn't it because they all knew why they were separating.)

these civilizations were located around fertile rivers, where they could produce an abundance of crops