Which of the following passages uses circular reasoning?
a) After Herve explained that he thought they should get a dog, Aubrey replied that a cat chased her down the stairs once.
b) Dogs are better than cats because dogs just are better pets to have.
c) Maribel was deciding what dog to adopt, when Todd said to her, "You can't take care of a dog because you don't like cats!"
d) Nine out of ten people agree that dogs are the best pets to have.