Which of the following characters can be used to distinguish gymnosperms from angiosperms?
Angiosperms are also called flowering plants. They have seeds that are enclosed within an ovary, while gymnosperms have no flowers or fruits, and have unenclosed or naked seeds on the surface of scales or leaves. Gymnosperm seeds are often configured as cones. The characteristics that differentiate angiosperms from gymnosperms include flowers, fruits, and endosperm in the seeds.
So, the correct answer is "option A"