The correct option is A Young anther
Organisms show two basic types of cell divisions - mitosis and meiosis. Mitosis is responsible for growth due to increase in cell number and asexual reproduction. Meiosis is a specialized type of cell division which occurs in the germ cells and produces haploid gametes. A young anther will be filled by diploid microspore mother cells undergoing meiosis to produce haploid microspore tetrads. Each haploid microspore of the tetrad will produce a haploid microspore. Each haploid microspore will mature into a pollen grain.