The correct option is D d) Gymnosperms
D)
Explanation: Gymnosperms are seed-bearing vascular plants in which the ovules or seeds are not enclosed in an ovary. The word "gymnosperm" comes from the Greek word gymnospermos, meaning "naked seeds". Gymnosperm seeds develop either on the surface of scale or leaf-like appendages of cones, or at the end of short stalks.The largest group of living gymnosperms are the conifers (pines, cypresses and relatives). There are around 1000 species of gymnosperm.