How did the neolithic revolution contribute to the rise of early river valley civilizations?

a.
it forced human societies to band together to protect themselves from warlike civilizations.

b.
it led to the creation of permanent farming communities that grew into the first civilizations.

c.
it allowed civilizations to move around more easily to adjust to changing climate conditions.

d.
it prevented civilizations from treating people unfairly based on their class, religion, or gender.