What part of a flower is known for containing the ovary?

The pistil is the part of the flower that contains the ovary, making it the correct choice. The pistil is a critical component of the flower's reproductive system, which typically consists of three main parts: the stigma, the style, and the ovary. The ovary is located at the base of the pistil and houses the ovules, which can develop into seeds upon fertilization. This process is essential for the reproduction of flowering plants, as the ovules must be fertilized for the development of seeds and fruits.

In contrast, the stamen, which is the male reproductive part of the flower, consists of the anther and filament but does not contain the ovary. Petals serve primarily to attract pollinators and protect the reproductive parts of the flower, while sepals act as protective coverings for the developing flower bud and do not play a role in housing the ovary either. The distinction between these floral structures is crucial for understanding plant reproduction and the overall anatomy of flowering plants.