(D) is the right answer.
1. haplontic life cycle : Eg. Many algae such as Volvox, Spirogyra and some species of Chlamydomonas. While most algal genera are haplontic, some of them such as Ectocarpus, Polysiphonia, kelps are haplo-diplontic. Fucus, an alga is diplontic. 2. diplontic life cycle : Eg. All seed-bearing plants i.e. gymnosperms and angiosperms 3. Haplo-diplontic life cycle : Bryophytes and pteridophytes exhibit an intermediate condition; both phases are multicellular.But they differ in their dominant phases. Bryophytes - haploid gametophyte is dominant, independent, photosynthetic, thalloid or erect; pteridophytes - diploid sporophyte is dominant, independent, photosynthetic, vascular plant body