Fertilizers added to crops on farms can collect in runoff and enter the watershed. This problem would be reduced in areas where A A) crops are grown for animals as well as humans. A) crops are grown for animals as well as humans.

B B) farms are situated on the sides of mountains. B) farms are situated on the sides of mountains.

C C) an extended drought leads to little or no rain. C) an extended drought leads to little or no rain.

D D) the growing season of the crops is longer. D) the growing season of the crops is longer.