Read the following passage:
"Cat owners hold several truths to be self-evident: that cats are better than dogs; that cat people are better than dog people; that life is incomplete without at least one feline companion. However, not all cat owners agree whether their cats belong indoors or outdoors.
"Indoor advocates point out that cats lead longer and more comfortable lives when they aren’t exposed to all the predators, poisons, diseases, fights, and accidents that lurk outside. Their owners are happier too, because they don’t have to worry about their pets’ safety, or put up with the animals bringing fleas and mangled birds and rodents into the home. In addition, outdoor cats do significant damage to the environment. Free-roaming felines kill billions of songbirds every year and have even caused the extinction of dozens of small mammal species.
"On the other hand, owners who support letting their pets outside say it is cruel to interfere with a cat’s instinctive desire to hunt and roam. They claim that a house-bound lifestyle is actually less healthy because the animals grow bored and fat. These owners also say that anyone who truly loves their pet should be happy to accept some worry and mess in exchange for seeing it live a happier, more natural life. While the outdoor faction acknowledges that their cats kill wildlife, they point out that the toll includes pests like rats and mice, which damage crops, attack other animals, and spread human diseases."
Which two subjects are compared in the passage?
the benefits and hazards of natural and unnatural lifestyles
dogs and cats
good pets and bad pets
indoor cats and outdoor cats