The policy of dividing the South into military districts during Reconstruction primarily aimed to enforce the law and provide protection for newly freed African Americans as well as to facilitate their integration into society as citizens with rights. The successes of this policy in protecting and providing opportunities for African Americans, however, were largely reversed when the policy ended and Southern states implemented discriminatory laws. Therefore, the most accurate answer would be:
C) It helped protect and provide opportunities for African Americans, but these successes were reversed when the policy ended.