The correct option is D ovules of pistil
The male sex organs in a flower is the stamen. Each stamen consists of a slender filament with an anther at the tip. The anthers produce pollen grains.
The female sex organs in a flower is the pistil. Pistil consists of an ovary enclosing one to many ovules. Within ovules are present highly reduced female gametophytes termed embryo-sacs.