The correct option is B Leaf lamina
Nepenthes or pitcher plant is a shrub or climber having large pitchers of 10-45 cm in length. Leaves arealternate and modified with a foliaceous leaf base, tendrillar petiole and lamina modified into pitcher with the leaf apex forming its lid. The lid is partly bent outwardly in such a way as to protect the open mouth of the pitcher from rainfall. Insects are attracted by the gaudy colour of the lid and pitcher as well as the nectar available on the rim and neck of the pitcher.