A conjoint vascular bundle is one in which xylem and phloem are

Explanation-

In the case of gymnosperms and angiosperms, the vascular tissues are present in the patches known as a vascular bundle.
The vascular bundle is radial in roots and conjoint in the case of stems and leaves.

Radial bundle-In this xylem and phloem are arranged into separate bundles called xylem and phloem bundles.
Radial bundles are the characteristics of roots.

Conjoint bundle-They contains both xylem and phloem. It is of three types-
Collateral bundles-These are those bundles in which xylem and phloem are on the same radius, where phloem lies outside and xylem towards the inner side.
Bicollateral bundle-In this both phloem lie on both sides of the xylem. All of the three lies within the same radius.

Concentric bundle-Here one vascular tissue forms a solid core and the other surrounds it.
Amphicribal bundle-Xylem forms a central core while phloem surrounds the xylem from all sides.
Amphivasal-Phloem lies in the center whereas the xylem surrounds it.


Final Answer-

In the conjoint vascular bundle, the xylem and phloem are on the same radii.

So, The correct option is C.