Please choose the correct answer to the question: The Water Quality Act of 1987 required the development of standards that would prevent toxic pollutants from reaching dangerous levels in bodies of water. This act affected the amounts of toxic chemicals that could be discharged into bodies of water. Which of the following would have been most regulated by this act?

Answer1: feed lots Answer2: private homes Answer3: paper mills Answer4: grocery stores

Answer format: answer1/answer2/answer3/answer4
Answer: answer3