What event disrupted the agricultural norms and intensified hunting competition between native american groups in the plains? pls

When the horses arrived with the Spanish colonizers, the agricultural norms were disrupted and the hunting competition between the native groups intensified.

Explanation:

The Indian men who came on the horses had more power than other people. They became wealthier and had a higher social status. The Indians traded for horses and guns. The would trade their buffalo blankets, handmade beads, robes made of buffalo hides. The tribes did not share resources like they did before the horses and colonizers arrived.

the correct answer is:

b) a rich merchant.