The correct option is B 20
Meiosis is a specialized type of cell division which reduces the chromosome number by half. This process occurs in all sexually reproducing eukaryotes both single-celled and multicellular including animals, plants, and fungi. In meiosis, DNA replication is followed by two rounds of cell division to produce four daughter cells with half the number of chromosomes as the original parent cell. The two meiotic divisions are known as meiosis I and meiosis II. Meiosis occurs in germ cells and not in vegetative cells. Microscope mother cells undergo meiosis for production of male gametes. Each division yields 4 male gametes from each mother cell. So, 20 microspore mother cells are required to produce 80 male gametes in angiosperms.