Which statement explains how farmers contributed to their own problems in the late 19th century ? a. political divisions between farmers who grew food crops and farmers who grew cash crops reduce the political power of farmers. b. a high level of productivity resulted in low crop prices that made farming less profitable. c. competition for the best land drove land prices up to a level where most farmers could not afford to expand their production. d. over reliance on chemicals fertilizers and pesticides resulted in a short-term gains but reduced the productivity of farmland