(D) is the right answer.
1. Haplontic life cycle : The dominant, photosynthetic phase in such plants is the free-living gametophyte. 2. Diplontic life cycle : The gametophytic phase is represented by the single to few-celled haploid gametophyte. 3. Haplo-diplontic life cycle : Bryophytes and pteridophytes exhibit an intermediate condition; both phases are multicellular.But they differ in their dominant phases. bryophytes : A dominant, independent, photosynthetic, thalloid or erect phase is represented by a haploid gametophyte pteridophytes : multicellular, saprophytic/autotrophic, independent but short-lived haploid gametophyte.