Select the correct answer. Which describes a significant difference between the North and the South in the years leading up to the Civil War? A. The North did not allow slavery, while the South depended on it. B. The North supported two major political parties, while the South supported only one major political party. C. The North had a system of railways while the South relied only on road and river systems. D. The North grew its own food, while the South focused on cash crops and imported most of its food.