Which of the Following Was NOT a Way That the Market

Which of the following was NOT a way that the market revolution changed western farming?

A) As the West became more settled, western farmers found that they could cater to the market and grow crops they could sell.
B) John Deere's steel plow made it easier to till larger quantities of soil.
C) Cyrus McCormick's reaper made it quicker and easier for them to harvest wheat.
D) Eastern banks and insurance companies financed the acquisitions of supplies needed to expand farmland.
E) Farmers in the Old Northwest used slave labor to expand their production.