Which is female reproductive organ in a flower?

Answer: Option A

The carpel is a female reproductive organ in a flower.
A carpel is the female reproductive part of the flower usually composed of the style and stigma and usually interpreted as modified leaves that bear structures called ovules, inside which egg cells ultimately form.
Carpels are thought to be phylogenetically derived from ovule-bearing leaves or leaf homologues, which evolved to form a closed structure containing the ovules.