The correct answer is Choice D - <span>Foreign competition drove the price of cotton down.
</span>During the Civil war, cotton production in the south reduced significantly. This opened up opportunities for the cotton market in other countries, particularly India and Egypt. The competition from these foreign nations made the south (and by extention, America) to lose its monopoly in the cotton industry during the civil war, and gave them a hard time recovering after the civil war.
The answer is D. Remote rivalries drove the cost of cotton down. Because of Abraham Lincoln's Union Blockade, the South was not ready to showcase their a huge number of parcels of cotton. He had the careful step that Europe would intercede with the fare of cotton, however they didn't. Accordingly, cotton generation expanded in different parts of the world (e.g. India and Egypt) influencing America to lose its imposing business model in the cotton business.