The Adoption of Horses by Native American Tribes Such as the Sioux

The adoption of horses by Native American tribes such as the Sioux, Apaches and Blackfeet  

A) enabled them to wage more successful wars against their enemies.
B) allowed them to travel across the vast expanse of North America, from Atlantic to Pacific.
C) transformed their cultures into wide-ranging, hunter-gather societies that roamed the Great Plains.
D) led them to shift from agriculture to ranch-based economies.
E) All of these