The answer is b. Angiosperms. Bryophytes are seedless plants. Gymnosperms and Angiosperms have seeds. The difference between these two groups is in the seed position. If seeds are inside ovaries, a plant belongs to Angiosperms. If seeds are outside ovaries, on the scales for example, a plant belongs to Gymnosperms. Since apple flowers produce seeds inside ovaries, it belongs to Angiosperms.
