31. A key difference in seed protection and developmental between angiosperms and gymnosperms is that: (A) Angiosperm seeds develop exposed on cone scales, while gymnosperm seeds are enclosed in fruits. (B) Both produce seeds that are fully exposed to the environment at all stages. (C) Angiosperm seeds develop enclosed within a fruit, while gymnosperm seeds develop exposed on cones or modified leaves. (D) Gymnosperm seeds require animal dispersal within fruits, unlike angiosperms. (E) Angiosperms produce naked seeds, whereas gymnosperms always have seeds protected by an ovary.