have a mantle

A) gastropods
B) bivalves
C) cephalopods
D) all mollusk groups

Mantle

In geology, the layer of the Earth between the crust and the outer core; in biology, a tissue that encloses the vital organs of mollusks and secretes the shell.

Mollusk Group

A diverse group of invertebrate animals that includes snails, clams, squids, and octopuses, characterized by a soft body that is often protected by a hard shell.