The correct option is C Pollen after germination
The egg producing gametophyte is known as a megagametophyte and the sperm producing gametophyte as a microgametophyte. In seed plants, the microgametophyte is called pollen. Seed plant microgametophytes consits of two or three cells when the pollen grains exit the sporagium. The megagametophyte develops within the megaspore of extant seedless vascular plants and within the megasporangium in a cone or flower in seed plants. In seed plants, the microgametophyte (pollen grain) travels to the vicinity of the egg cell (carried by a physical or animal vector), and produces two sperms by mitosis.