The correct answer is D) all of the above.
As a result of Carleton's order to kill Navajo men, many armies volunteers quit, Carson cut off the Navajo food supply, and the Navajo were forced to surrender for lack of food.
James Henry Carleton (1814-1873) was a Union's Army officer that fought against the Native American Indian tribes in the southwest of America. Specifically, he was obsessed with the Navajo, that in those years robbed and killed whites. He and Colonel Carson took Canyon de Chelly in northeastern Arizona and killed many Navajo men.
The options of the question were A) many armies volunteers quit, B) Carson cut off the Navajo food supply, and C) the Navajo were forced to surrender for lack of food, and D) all of the above.