The correct option is
C Vascular bundle
The procambium is a meristematic tissue concerned with providing the primary tissues of the vascular system. The cambium proper is the continuous cylinder of meristematic cells, responsible for producing the new vascular tissues in mature stems and roots.
Procambium lies just inside of the protoderm and develops into primary xylem and primary phloem. It also produces the vascular cambium and cork cambium, secondary meristems.