Fill in the blank (_) in the following sentence from the following choices.
Sentence: Carrie had to bring their pet to the vet more often than Erin had to bring theirs because the pet of _ suffered from less illnesses.

Choice 1: Carrie had to bring their pet to the vet more often than Erin had to bring theirs because the pet of Carrie suffered from less illnesses.
Choice 2: Carrie had to bring their pet to the vet more often than Erin had to bring theirs because the pet of Erin suffered from less illnesses.
Which of the choices is correct? Respond with only "1" or "2" and no additional text.
2
1.