How did the Missouri Compromise keep the Union stable?

Responses

A. A balance of power was kept in Congress by Missouri entering as a free state and Maine entering as a slave state. A balance of power was kept in Congress by Missouri entering as a free state and Maine entering as a slave state.

B. Missouri entered the Union as a free state and new states were allowed to choose to be a free or slave state without interference from Congress.Missouri entered the Union as a free state and new states were allowed to choose to be a free or slave state without interference from Congress.

C. Missouri entered the Union as a slave state and no other states were allowed to enter as slave states.Missouri entered the Union as a slave state and no other states were allowed to enter as slave states.

D. A balance of power was kept in Congress by Missouri entering as a slave state and Maine entering as a free state.A balance of power was kept in Congress by Missouri entering as a slave state and Maine entering as a free state.

A. A balance of power was kept in Congress by Missouri entering as a free state and Maine entering as a slave state.