At sand creek, a. kit carson protected the village. b. the navajo were peaceably moved to reservations. c. chivington boasted of killing many native americans d. a treaty was signed

c. Chivington boasted of killing many Native Americans.

Explanation:

The Sand Creek massacre (1864) was an attack against Cheyenne and Arapaho people by the U.S. Army in the American Indian Wars. Led by U.S. Army Colonel John Chivington,  troops from the Colorado U.S. Volunteer Cavalry destroyed the Native American village in southeastern Colorado Territory and killed and mutilated many of them. At first, the attack was announced as a triumph against the enemy. However, soon the witnesses and survivors denounce the massacre.

C is the correct answer

Explanation:

sorry i do not know this

offline recommendation systems option b

because recommendation systems produce a list of two ways

1. through collaborative filtering

or

2. through content-based filtering