Questions 14 to 17 are based on the following passage. At the end of the passage, you will be given 20 seconds to answer the questions. Now listen to the passage. According to the professor, what was one result of the increased use of machinery on farms of the United States
A．Prices for farm products rose. B．Farmers became more dependent on loans from banks. C．Jefferson established government programs to assist farmers. D．Farmers relied less on foreign markets.