Please choose the correct answer to the question: Why was my son-in-law required to add rugs or carpeting to his upstairs apartment when the ground floor wasn't?

Answer1: So it would look good then prospective renters took a tour Answer2: Because they didn't want him to scratch up the wood floors. Answer3: Because they didn't want the downstairs renters to be as likely to complain about noise Answer4: Because they didn't want to pay for carpeting themselves.

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