Sometimes, the whole leaf is modified into a wire-like structure called as leaf tendril e.g., sweet pea. In certain vining, angiosperms with compound leaves, some of the terminal leaflets have modified into a hook like structures for helping the plant in climbing e.g., Argemone, Opuntia, Aloe, cat's nail. Leaves of some plants are modified to pitcher shape e.g., Nepenthes, Dischidia. The trapping mechanism in Utricularia involves active trapping (rapid plant movement). The bladder is a modification of an underwater leaf segment.
Thus, the correct answer is option A.