Identify the sentence that contains a vague pronoun reference. A) Georgia wondered if her sister, Ashley were fast enough to make the track team. B) At the state swim meet, the coaches post the schedules to help the athletes and parents keep track of events. C) Michael and Erin left their puppy with the vet, so they were sure their puppy was safe. D) The car bumped the side of the neighbor's mailbox, but it didn't need any repairs.