Why does the author mention The Hound of the Baske...

Câu hỏi: Why does the author mention The Hound of the Baskervilles?

A Dr. Watson makes his first appearance in that world.

B The story is one that involves Professor Moriarty.

C It was the first novel he wrote involving Sherlock Holmes.

D It is the title of one of his well-known Sherlock Holmes stories.