The correct option is A A is correct, and R is the correct explanation to A
Most of the algae are haplontic, unlike Fucus which is an algae (Phaeophyceae) with a diplontic life-cycle. Hence, its life cycle is related to angiosperms. In the diplontic life-cycle, the haploid gametophytic phase is represented by the single to few celled haploid gametophyte. The diploid sporophyte is the dominant phase.