How did the Shang dynasty gain control of the yellow river valley

C. They used irrigation to manage water and gain control over the people.

Explanation:

This is for Edge Quiz 2020 and I got it right. Hope this helps.

a

hey man i never said i was right

but im a great guesser

an expansion is one of two basic business cycle phases; the other is contraction. the transition from expansion to contraction is a peak, and the changeover from contraction to expansion is a trough.