The correct option is D Bird of paradise flower (Strelitzia reginae)
The 'bird of paradise flower', or 'crane flower' as it is sometimes known, was first introduced into Britain in 1773 by Sir Joseph Banks. The plant itself can reach up to 5 feet in height with a 2-3 foot spread. The plant is trunk less, compact and clustering but slow growing with fleshy roots. S. reginae has banana shaped stiff- leathery, concave, oblong, bluish-gray leaves with a pale or red midrib. The leaves are attached to a long stalk that sometimes reaches up to 2 feet in length.