After fertilization, the ovary of a flower develops into what?

Correct answer: Fruit

In flowering plants, fertilization is followed by development of the ovary into the fruit. The ovules contained inside the ovary become seeds, which is why option B is a tempting but incorrect distractor. Pollen grains are involved in pollination before fertilization, and the stigma receives pollen. Thus, the governing biological relationship is ovary to fruit and ovule to seed, making option A correct.