Select the option that correctly matches a characteristic feature with the group of three animals.

Chiton, squid and snail belong to Mollusca. All the three have a file-like rasping organ in the oral cavity called the radula.Roundworm and hookworm belong to Aschelminthes. They lack flame cells.Parapodia are absent in earthworm and leech.Prawn has gills for respiration. Tracheae are found in terrestrial arthropods like locust.