Answer:
The answer is B - General Sherman wanted to ensure that the South could not recover economically and keep fighting.
Explanation:
The south by this point in this war was in a panic essentially. Their economy relied heavily in agriculture, and burning their fields, liberating slaves, etc. was a good way for the Union to make sure the south couldn't recover. It is also important to note, Georgia was the heart of the south as well, and burning cities like Augusta was a real good way to demotivated the south as well as obliterating whatever economy was left.