Based on my knowledge, I would say answer A
Answer:
The cotton gin
Explanation:
Because since farmers needed to grow more cotton, they used more slave labor.
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<u><em>johannelbekian</em></u>
I know C is right, but the others not sure
I would say that by at least the late 1800's after the Industrial Revolution, goods were being mass produced in factories by the workers ie one enterprise could produce 100's if not 1000's of the same goods so the price came down and allowed even the ordinary worker to buy the goods like say washing machines, clothes items, etc.