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The answer is C: It was a Union Victory that allowed Lincoln to issue the Emancipation proclamation

Explanation:

The Battle of Antietam ended by a Union victory. It was considered the bloodiest battle fought on September 17, 1862, between the Union and the Confederacy during the Civil War. The Battle of Antietam was a crucial victory for the Union Army because was the first major battle in the American Civil War to take place on their soil. The battle Kept British interference out of the U.S. and kept them uninvolved with the war. It was a turning point for President Abraham Lincoln as it provided him the opportunity to announce the Emancipation Proclamation.