The battle of antietam showed the union
a. it was getting weak.
b. it had strong leadership.
c. it could win the war.
d. it needed from great britain.

(i know it's either b or c)

The correct answer is C. The Battle of Antietam showed the Union that ir could win the war.

The battle took place on September 17, 1862, near Sharpsburg, in Washington County, Maryland, United States, and in the vicinity of the Antietam stream. The battle was part of the Maryland Campaign and is the bloodiest in the history of the United States that was fought in a single day, with almost 23,000 casualties.

Despite the numerical superiority of the Union, McClellan's attacks failed to concentrate troops, allowing Lee to turn his troops inside his ranks to deal with each attack. Despite McClellan's abundant reserve forces that could have been deployed to achieve localized successes, McClellan failed to destroy Lee's army. Nevertheless, the invasion of Maryland by Lee was stopped, although this one could retire to Virginia without opposition on the part of the cautious McClellan. Although the battle did not produce a conclusive result in tactical terms, it had a unique importance, since Lee's retreat was enough to give President Abraham Lincoln the confidence to announce his Proclamation of Emancipation.

a, he promoted disarmament