The correct answers are A, C, and D.
Thanks to the invention of the cotton gin at the end of the 18th century, picking and producing cotton became much more efficient and profitable. Cotton was a product that was in high demand, as it could be used for textiles. This resulted in the Southern states dedicating their entire economy to this one good. This also resulted in an increase in the amount of slaves in the South as plantation owners relied on this type of labor in order to generate the most profit possible.
