Ответ:

a) Miss Marple, Hercule Poirot, Sherlock Holmes and Captain Nemo are fictional characters created by different authors. They are famous literary characters who have appeared in novels and other adaptations.

b)

  1. Who is Sherlock Holmes? — He is a clever detective created by Arthur Conan Doyle.
  2. Who is Captain Nemo? — He is the mysterious captain of the submarine Nautilus in Jules Verne’s novel Twenty Thousand Leagues Under the Sea.