please help ill mark as brainlist !!!

what was the significance of the Emancipation Proclamation?

A ) The goal of the war was now to end slavery and Europe would no longer help the South.
B ) Freed all slaves throughout all of the United States.
C ) Commemorated the fallen soldiers at Antietam.
D ) Allowed all Confederate soldiers to go home without being harassed and declared they would not be tried for treason.