Recall How did the Buffalo Soldiers get their name?

Buffalo soldiers were African American soldiers who had participated in the Civil War and were assigned to assist with the military offensive on the frontier. Buffalo soldiers were instrumental in U.S.government efforts to remove Native Americans from the plains and force them onto reservations. Buffalo soldiers defended many settlers from raids and participated in numerous campaigns and attacks on Native American tribes. Buffalo soldiers were segregated from other troops and were often treated disrespectfully among their own army. Buffalo soldiers were highly effective in battling Native Americans, and it was Native Americans who labeled them “buffalo soldiers.” These African American soldiers became respected as formidable opponents and worthy warriors among Native Americans and the tribes did not underestimate their fighting skills during battle.

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i am sure the answer is d