The correct option is D Archegonium
Archegonium is the the female reproductive organ in ferns and mosses. An archegonium also occurs in some gymnosperms, e.g., cycads and conifers. It is a flask-shaped structure, consists of a neck, with one or more layers of cells, and a swollen base and the centre, which contains the egg. Neck-canal cells, located above the egg, disappear as the archegonium matures, thus producing a passage for entry of the sperm. The sperm are produced in the corresponding male reproductive organ, the antheridium.