The correct option is D All of the above
The pistil is the innermost whorl of a flower. Each pistil consists of three parts, they are
i) Ovary: The bottom part of the carpel is an ovary. It contains ovules in it. It also contains seeds which turn into fruit after the fertilization process.
ii) Style: The connecting part of the stigma and the ovary is style.
iii) Stigma: It is a sticky portion where pollen grains fall, attach to the surface and germinate.