Read the following passage and then select the correct answer: According to some sources, there are more than 80 million cats living in American houses as pets today. Cats offer companionship and relaxation, but they also have specific needs that require pet owners' attention. Just as a human being must clean his dishes and his bathroom, a cat needs to have a bacteria-free food dish and litter box. With these facts in mind, Americans need to begin working on ways to improve the cleanliness of home areas for their cats.