How Did the Cotton Gin Impact the Growth of American

How did the cotton gin impact the growth of American slavery in the first decade after its invention?

A) Nearly 75,000 new slaves, the highest ever in one decade, were imported from Africa before the international slave trade was banned in 1808.
B) Northern states repealed laws that either abolished slavery or gradually emancipated slaves so that these states could profit economically from slave labor.
C) Southerners invested large amounts of capital in railroads and canals that made it easier to transport large numbers of slaves from the Upper South to the expanding black belt in western Georgia, Alabama, and Mississippi.
D) The slave population in all parts of the South declined significantly as the cotton gin made it easier to prepare cotton for sale.