Cortex is the region found between Endodermis and pith, Epidermis and stele, Endodermis and vascular bundle, Pericycle and endodermis

Cortex is the ground tissue present below the epidermis. It surrounds the central cylinder and endodermis lines the outermost layer of the cylinder. So, the region between epidermis and stele is cortex. Pericycle is present between endodermis and vascular bundle. The whole ground tissue system (cortex, endodermis and pericycle) is present between epidermis and stele.Therefore, the correct answer is option C.