What were the two reasons the southern states seceded from the Union?

A$.$ Lincoln won the Presidential election and the Supreme Court's decision on the Dred Scott case favored the free states

B$.$ Lincoln won the Presidential election and Lincoln called for volunteers from all states to put down the southern rebellion

C$.$ Lincoln issued the Emancipation Proclamation and Lincoln called for volunteers from all states to put down the southern rebellion

D$.$ Lincoln refused to hand over Fort Sumter to the Confederacy and the Supreme Court's decision on the Dred Scott case favored the free states