The correct answer is A) The Union victory gave Lincoln the strength and support needed for the issuance of the proclamation.
The Battle of Antietam, fought on September 17, 1862, was the bloodiest single-day battle in American history and ended in a tactical draw. However, the Union Army's ability to stop the Confederate advance had strategic significance. Following this battle, President Abraham Lincoln felt bolstered to issue the Emancipation Proclamation, which declared the freedom of slaves in Confederate-held territory. This proclamation not only aimed to weaken the Confederacy but also transformed the Civil War into a fight for freedom.