Final answer:
The microspore develops into a pollen grain. So, the correct answer is option c.
Step-by-step explanation:
The microspore develops or matures into a pollen grain. In flowering plants, pollen is produced in a structure called the microsporangium, which is located in the anther of the stamen. The microsporangia contain microspore mother cells that divide by meiosis to produce haploid microspores, which then develop into pollen grains. The pollen grain is the male gametophyte and is responsible for fertilizing the egg in the female gametophyte.
So, the correct answer is option c