The correct answer is B. They were forced to move onto reservations.
Explanation
The Battle of Palo Duro Canyon (1874) was a military confrontation that pitted the United States Army under the command of Ranald Mackensie against the tribes of the plains of Texas as part of the fighting of the Red River War. In this confrontation, the United States imposed itself on the natives who had to vacate the territory they inhabited and had to stay in the Fort Sill reservation. Therefore, the correct answer is B. They were forced to move onto reservations.
