The correct option is B Radula
Radula is a file-like organ for grinding or rasping the food. It is present in the mouth of the molluscs.
Visceral hump is one of the segments present in the body of a mollusc. Mantle forms the outer covering of the body of a mollusc. It is instrumental in the secretion of the outer shell.
Malpighian tubules are found in the arthropods and is responsible for excretion and osmoregulation.