In case tunica is multilayered, which is likely to happen.
When the tunica is multilayered, then the condition is known as multistratose tunica. The layers of tunica can be designated as L1, L2, L3, etc. The L1 i.e. the outermost layer of the tunica will rise to the epidermis. Thus the rest of the layers would form the cortex and the vascular tissues, as seen in Datura.
Hence, the correct answer is D.