In the X sized vascular bundles of dorsiventral leaves, xylem is present towards Y epidermis.

Now, identify X and Y and select the correct option

Vascular system includes vascular bundles, which can be seen in the veins and the midrib. The size of the vascular bundles are dependent on the size of the veins. The veins vary in thickness in the reticulate venation of the dicot leaves. In the vascular bundle, position of xylem is towards the adaxial  epidermis (as evident in the diagrams)