Concept:Meiosis in flowering plants gives rise to haploid spores that later form the gametophyte generation.Explanation:In flowering plants, meiosis occurs in spore mother cells and produces haploid spores.These spores are the first cells that develop into gametophytes, such as the pollen grain or embryo sac.Because “spore” is not among the options, the intended answer is gametophyte.Answer:B. gametophyte