Which of the following factors made it easier for the Army Reserve guards to mistreat detainees at Abu Ghraib?

A. There had been numerous rebellions and fights at the prison in the past, one of which had resulted in the death of two prison guards.
B. The detainees refused to obey prison rules.
C. The detainees were members of a different cultural and ethnic group, which made it easier to perceive them as members of a despised and threatening out - group.
D. The guards were outnumbered and frequently physically threatened by the detainees, who had hidden makeshift weapons throughout the prison.