The correct option is B Xylem and phloem on the same radius.
In conjoint type of vascular bundles, the xylem and phloem are arranged together in the same radius of vascular bundles. These are found in stem and leaves. While in radial vascular bundles, the xylem and phloem are arranged separately in different radii of vascular bundles and are found in the roots of monocots and dicots.