The correct option is A All of the above
Monoplacophora is a polyphyletic class of molluscs with a cap-like shell, living at the bottom of the deep sea.
Amphineura or Chiton are small to large marine molluscs in the class Polyplacophora.
Scaphopoda is a class of marine molluscs which includes 200 species of burrowing animals.
Therefore, the correct answer is option D.