In the period of industrialization, it was easier to harvest crops so supply went up and demand stayed the same causing prices to drop. The "newly" freed slaves also started farming, increasing the supply.
C. Gold
West africa was considered wealthy so they would trade gold and salt whereas other areas would trade ivory and other goods
The Answer Is:
(A.) "Their success encouraged people to experiment and invent new products"
The answer is C, also Hamilton helps with a lot of American history answers!