Xylem parenchyma.
Medullary rays.
Pericycle.
Endodermis.
In woody dicots, the strip of cambium between the primary xylem and phloem is called as the interfascicular cambium. The interfascicular cambium is formed from the cells of the medullary rays adjoining the interfascicular cambium. This result in the formation of a continous cambium ring.Thus, the correct answer is option A.