Please choose the correct answer to the question: When using more than the recommended amounts of pesticide on farmland, yards, and gardens, what is most likely to occur?

Answer1: Higher levels of pesticide may be less effective. Answer2: The pesticides may break down quickly. Answer3: Water supplies can be contaminated by pesticide runoff. Answer4: The pesticide will increase the plant production.

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