What Role Did Southern Planters Play in the Market Revolution

What role did southern planters play in the market revolution of the early nineteenth century?

A) Southern cotton profits provided much of the capital for northern industrialization.
B) Wealthy southern planters provided most of the financing for American roads, canals, and railroads.
C) By shifting from cotton to food crops, southern planters made it possible for growing industrial cities to be fed.
D) By shifting to a barter economy, southern planters freed up cash that could be invested in northern industry.