Why Did the Southern States Vote for Hamilton's Plan to Assume

Why did the southern states vote for Hamilton's plan to assume state debts?

A) Most of them had been unable to pay off their debts and stood to gain from federal assumption of that debt.
B) Most southern senators and congressmen had speculated in state bonds and would make large profits if they were repaid in full by the federal government.
C) Southerners believed that a stronger union would benefit the South more than other sections of the nation.
D) Northern representatives agreed to transfer the federal capital from Philadelphia to a location on the Potomac River in Virginia.
E) Most of them had no bonds outstanding and so stood to neither lose nor gain by the proposal.