Which of the Following Was a Result of the Sand

Which of the following was a result of the Sand Creek Massacre in which Colorado militiamen slaughtered a large number of peaceful Native Americans?

A) The central plains remained peaceful for the next several years because so few Native Americans were left.
B) Native American tribes such as the Arapaho and Sioux celebrated what had befallen the Cheyenne and joined forces with the militiamen.
C) Congress and the army launched investigations that concluded that the Native Americans had been murdered in cold blood.
D) Colonel John M. Chivington became the leading voice for Native American rights following the Civil War.
E) All military captains and colonels destroyed any evidence of the massacre, refused to testify, and grew more unified than ever.