Which sentence from the article shows the author's bias?
a.) the puppies are often poorly housed and don't receive proper medical care.
b.) many people believe that buying a dog from a breeder or pet store gives you a better chance of ending up with a healthy, compatible pet.
c.) only a selfish, cold-hearted person would decline to adopt one of them.
d.) animal shelters are struggling to deal with a staggering surplus of pets.