The passage suggests that which of the following was true of Black units’ disease mortality rates in the Civil War?
A.They were almost as high as the combat mortality rates of White units.
B.They resulted in part from the relative inexperience of these units when in combat.
C.They were especially high because of the nature of these units’ usual duty assignments.
D.They resulted in extremely high overall casualty rates in Black combat units.
E.They exacerbated the morale problems that were caused by the army’s discriminatory policies.