Which statement BEST explains the outcome of the Missouri Compromise?

AControl of congress shifted to the free states as one free state Was admitted to the Union.

BControl of congress shifted to the slave states as one slave state was admitted to the union.

Cpower in congress was up for grabs as states scrambled for enough votes to secure a victory.

DPower sharing in congress was maintained as one slave state and one free state were added to the union.