Knowledgeable dog owners recommend obtaining a purebred dog from a ____ breeder, one who is _____ and respected by customers and breeders alike.

The comma following the word breeder is a clue that the words that follow will define or explain what kind of breeder is recommended. Only choice "Reputable . . . Admired " provides two words that can define or explain each other. A reputable breeder is one who is admired and respected.