Answer:
B.
Explanation:
The Battle of Antietam was fought between the Confederate General Robert E. Lee’s Army of Northern Virginia and the Union General George McClellan’s Army of the Potomac, on September 17, 1862, near Antietam Creek near Sharpsburg, Maryland. The battle is considered the bloodsoaked one-day in America's history.
After General H-o-o-ker from Union's army was shot in the foot, he leaves the warfield. After he left, there was no one to follow through on the Union success at Dunker Church. The Union, at that time, lacked a leader to unite the corps.
Therefore, option B is correct.
