Why does the government not do more to regulate nonpoint source pollution? a. nonpoint source pollution is less harmful to the environment, so it does not need to be regulated. b. point source pollution is more common than nonpoint source pollution, so it is more regulated. c. nonpoint source pollution is caused solely by animals, which are not possible to regulate. d. nonpoint source pollution is difficult to regulate, because its source is difficult to track. select the best answer from the choices provided a b c d