Which of the following best states why the battle of Antietam was considered a turning point in the war? (A) The union had more casualties than the confederacy (B) The confederacy had won all major battles until this one (B) The battle was considered the bloodiest one in US history (D) The battle allowed confederate troops to reach Washington, DC

Option B,  The confederacy had won all major battles until this one, is the right answer.

Explanation:

Occurred on 17th September 1862, the Battle of Antietam is also known as the Battle of Sharpsburg. This battle was a vital battle to shape the future of America and the bloodiest one-day battle in all of the military history of the United States.

The Battle of Antietam was a one-day bloodiest battle during the Civil War in America. This Battle has been regarded as one of the turning points in the history of America. This battle resulted in the loss of thousands of soldiers fighting from both sides (the North and the South). Though the battle was a draw on both sides, technically it was a loss for the South and thus the North got the victory in this battle.

i also think it is c