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Answer:The answer is He had been successful in the west.
The Correct option is A. Ulysses S. Grant given command of the Union armies in 1864 because he was successful in the West.
The Union Army
It was the Army of United States, which helped in defeating Confederate states army during the American Civil War. The Command of the Union armies was a debatable topic during Lincoln's governance.
At first Lincoln was not supportive of giving S.Grant the command of Union armies. It was at behest of other Congress leaders, and the successful victories of Grant in the West, that Lincoln accepted him as the Commandor of Union Armies.
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