Correct Option: B

Teredo (shipworm) is the member of class – Bivalvia (double shell plates). Shipworms are in fact not worms at all, but rather a group of marine molluscs (Eulamellibranchiata) in the family Teredinidae. They bore into submerged wood, and bacteria in a special organ called the gland of Deshayes enabling them to digest cellulose. The shipworms belong to several genera of which Teredo is the most commonly mentioned. The best known species is Teredo navalis.