Which of the following sentences, if added here, would most effectively introduce the subject of the remainder of the essay?

A. Like my dog at home, their dog was a German Shepherd and Golden Retriever mix.

B. Apparently, the role of dogs in America is nothing like it is in the third world.
C. Their dog had never played fetch before, so I tried to teach it how to play.
D. Dog lovers like myself always stop and play with the dogs that they cross paths with.