Unique feature of secondary growth in dicot root when compared with the stem is

Options

A. Formation of vascular cambium from stelar
B. Formation of cork cambium from extrastelar tissue in all species
C. Formation of both cork cambium and vascular cambium from stelar tissue in many of the species
D. Formation of vascular cambium from stelar tissue and cork cambium from cortical tissue in many of the species

Answer

C