The correct option is D Root of all vascular plants
Presence of radial vascular bundles is the characteristic feature of roots. Those vascular bundles in which xylem and phloem are present on different radii are known as radial vascular bundles. In between xylem and phloem bundles parenchymatous cells are present. This is seen in roots of all vascular plants. Radial vascular bundle are also called as simple vascular bundles. Thus, option D is correct answer.