Use this fact to answer the question: carpet absorbs sound

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

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

The answer is:
c.