Read the scenario.

Sarai is writing an essay to persuade her classmates to spay or neuter their pets. She provides statistics about the overpopulation of pets in the city. She also shows evidence that pets that are spayed or neutered live longer and behave better than pets that are not.

Which statement should Sarai use if she wants to appeal to authority in her argument?

Do you know how many cuddly kittens and frisky puppies need loving homes in our city?
I think there are so many irresponsible people in our city who do not spay or neuter their pets.
Studies by veterinarians show that neutering a dog makes him less likely to wander away from home.
If we have too many pets and not enough homes, then obviously everyone needs to spay or neuter their pets.