It is due to their ability to adapt in the varying circumstances
I would assume that c would be the answer, because stonewall jackson had very little importance, other than being used for propaganda. You can always replace a general. But D could also be an answer, but it's very unlikely. And also what victory are you referring to?
I think the answer is picking cotton because that's what people can do on the plantation fields and I also learnt about this a little bit in my history class.
Ohio, Indiana, Illinois, Michigan, Wisconsin, and part of Minnesota