Letter A is the correct one.
Lincoln signed, On September 22, 1862, the preliminary Emancipation Proclamation, which informed both the Confederacy and the Union of his intention to free all persons held as slaves in the rebellious states. The five-page document declared that slaves in the rebel states were free, provided them with the support of the U.S. government—including the Army and Navy, declared that freed slaves should be paid a wage, urged freed slaves to abstain from violence except in self-defense, and publically declared that all suitable freed men would be accepted into the armed services to fight in the war.