Pollen Grains Are Formed in the Anther of the Flower

Pollen grains are formed in the anther of the flower by which sequence of events?

A) Diploid microspore mother cells divide by meiosis to form four haploid microspores.Each microspore develops into a pollen grain by mitosis.
B) Haploid microspore mother cells divide by meiosis to form four diploid microspores.Each microspore develops into a pollen grain by mitosis.
C) Diploid microspore mother cells divide by mitosis to form four haploid microspores.Each microspore develops into a pollen grain by meiosis.
D) Haploid microspore mother cells divide by mitosis to form four diploid microspores.Each microspore develops into a pollen grain by meiosis.
E) Diploid megaspore mother cells divide by mitosis to form four diploid megaspores.Each megaspore develops into a pollen grain by meiosis.