Because of the industrial revolution farmers moved to the cities for a better life. However this did not happen because the area was very polluted and badly built homes meant lots of disease and death. Many people moved out of the villages so the farmers would have less business. I would say the last option is correct.
C. Because of poor soil in the area, farmers were willing to leave their farms to work in the factories.
Here is part of the text from lesson 6.01:
Workers: Due to the poor soil in the New England area, farmers were willing to leave their farms in search for work in the factories. These workers created the labor force in the factories.
