Explain why plants have ways of avoiding self-pollination

Because cross-pollination allows for more genetic diversity, plants have developed many ways to avoid self-pollination. These flowers make self-pollination nearly impossible. By the time pollen matures and has been shed, the stigma of this flower is mature and can only be pollinated by pollen from another flower. I hope this helps, Have a great day.

Icant be totally sure but i would say with confidence that it is example #1 about cells.