The correct option is C anther
Pollen grains contain the male gametophytes (three-celled structure) of angiosperms that develop inside the microsporangium (pollen sac) of the anther. The stalk of the stamen (microsporophyll) is called filament.
Female gametophytes (embryo sac) develop inside the megasporangium (ovule), which is enclosed inside the carpel or pistil.