The correct option is C Fruit
Post fertilization changes in angiospermic plants involve endosperm formation, embryo development, seed formation and fruit formation. During the course of fertilization in angiosperms one male gamete fuses with the egg to form a dipoloid zygote which gives rise to embryo after predetermined mode of divisions. The second male gamete fuses with the diploid secondary nucleus to form triploid endosperm which nourishes the developing embryo. Ovules at maturity or ripened ovules are known as seeds. Ripened ovary or fertilized ovary is called fruit.