A Scientist Who Has Studied the Aboveground Growth of Oak

A scientist who has studied the aboveground growth of oak trees,particularly the process of secondary growth of the shoots,wants to conduct the same type of study on root growth in oak trees.What difference,if any,is she likely to find in oak roots as opposed to shoots?

A) A lack of pith,because roots are not woody
B) A lack vascular cambium,because roots do not transport
C) A lack of cork cambium,because roots do not increase in width
D) Additional surface area due to the production of root hairs
E) No significant differences