The correct option is A Radula
The radula is a horny, ribbon-like structure found in the mouths of all molluscs except the bivalves. The radula, part of odontophore, may be protruded and it is used in drilling holes in prey or grasping food particles from a surface. It is supported by a cartilage-like mass (the odontophore) and is covered with rows of many small teeth (denticles). So, the correct answer is option A.