Although the South Lost the Civil War, It Was Possible

Although the South lost the Civil War, it was possible that Southern states would gain increased power in Congress when readmitted to the Union because:

A) Southern congressmen could use the threat of secession to intimidate Northern representatives
B) Southern congressmen would chair the key congressional committees
C) The number of Southern states had increased
D) For purposes of congressional representation, African Americans would count as a full person rather than as three-fifths of a person