Correct option is B
Prothallus is NOT an insectivorous plant. A thallus is the vegetative body of a green alga or other photosynthetic protist. A prothallus is a haploid structure that is the sexual reproductive organ of a fern. A thallus is a non-vascular plant that does not have true roots, stems, or leaves. Venus fly-trap, Pitcher—plant and Sundew are an insectivorous plant.