A feeding structure called a radula is possessed by?

Question

A.) mollusks
B.) arthropods
C.) annelids
D.) chordates

Answer 1

(A) mollusks

particularly gastropods (slugs and snails)

but the wiki page says that a Radula is common to all mollusks except the bivalves

see the wiki page for a nice diagram

Answer 2

(A) Mollusks

Radula is the scientific name for the toothed chitinous ribbon in the mouth of gastropods. They use it to graze and scrape diatoms and other microscopic algae off rock surfaces and other substrata.

The radula is common to all mollusks, except the bivalves, which feed by siphoning and filtering small particles from water.

plural Radulae, or Radulas, horny, ribbonlike structure found in the mouths of all mollusks except the bivalves. The radula, part of the odontophore, may be protruded, and it is used in drilling or in rasping food particles from a surface. It is supported by a cartilage-like mass and is covered with rows of many small teeth (denticles).