Good Race/ethnic Relations in the Military Are the Result of More

Good race/ethnic relations in the military are the result of more than just the increasing interracial contact. Racial integration in the military primarily required:

A) formal measures such as founding the Defense Equal Opportunity Management Institute (DEOMI)
B) positive attitudes from soldiers
C) early admission of black cadets to U.S. military academies after the Revolutionary War
D) all of the above