Read the passage.
(1) The Labrador retriever is a very popular breed of dog. (2) The most popular purebred breed in the United States, in fact. (3) The second most popular breed is the Yorkshire terrier. (4) Though Yorkies, as they are nicknamed, are small in size, they are big in popularity.
Which is the most effective way to correct the fragment in sentence (2)?
Add the missing subject.
Attach the fragment to sentence (3).
Attach the fragment to sentence (1).
Add the missing verb.