The correct option is A Ovary
A true fruit develops from ovary. A fruit is a part of a flowering plant that derives from specific tissues of the flower, one or more ovaries. A fruit develops as the ovules develop into seeds, the ovary begins to ripen and the ovary wall, the pericarp, may become fleshy as in berries or drupes or form a hard outer covering as in nuts. In some multiseeded fruits, the extent to which the flesh develops is proportional to the number of fertilized ovules.
Thus, the correct answer is option A.