Answer:
C. Sand Creek.
Step-by-step explanation:
On November 29, 1864, U.S. Army Colonel John Chivington led a surprise attack on a peaceful village of Cheyenne and Arapaho Native Americans at Sand Creek in Colorado. Chivington and his men killed approximately 150 Native Americans, including women, children, and elderly people who were sleeping or trying to flee. The attack was in retaliation for the death of Chivington's family in a Native American raid, although the specific tribe responsible for the raid was not present at Sand Creek. The Sand Creek Massacre was a brutal and unjustifiable act of violence against Native Americans and remains a shameful episode in U.S. history.
~ :D