I believe the answer is C. I know for sure it is not A or B.
I hope my answer helps :)
During the antebellum era, both the North and the South have been producing cotton and textiles. However, because the North has far more advantages than the south in terms of technological advancements, the North was able to produce more products by the end of the era such as guns, crops, machine parts and more.
D. Livestock and herders. Though it has been proven it was mainly carried by rats that traveled in rice sacks from other places.