Cotton Became Important to the Prosperity of the North as Well

Cotton became important to the prosperity of the North as well as the South because

A) about two-thirds of the southern cotton crop was sold to New England textile mills.
B) northern merchants handled the shipping of southern cotton.
C) cotton accounted for about half the value of all United States exports after 1840.
D) northern farmers profited from selling their foodstuffs to feed southern slaves.
E) northern investors controlled the cotton futures markets.