The correct option is
B HelixTerrestrial molluscs are also called as land molluscs. It includes all molluscs that lives on land. It belongs to class Gastropoda. It includes land snails and land slugs. Example of land snail includes Helix pomatia. Example of land slug includes Limax cinereoniger. They respire with the help of pulmonary sac.
Thus, the correct answer is option B.