What is the main function of the pistil in a flower?

The main function of the pistil in a flower is to produce eggs called ovules. The pistil is the female reproductive part of a flower and consists of three main components: the stigma, style, and ovary. The ovary contains ovules, which are the eggs that can be fertilized by pollen. When pollen grains land on the stigma, they can germinate and grow down the style to reach the ovary, where fertilization occurs. This process is essential for the sexual reproduction in flowering plants, leading to the development of seeds.

Other functions referenced in the options, such as holding pollen, providing support, and transporting nutrients, pertain to different parts of the flower or other plant structures but do not describe the primary role of the pistil itself.