One Important Difference Between the Anatomy of Roots and the Anatomy

One important difference between the anatomy of roots and the anatomy of leaves is that

A) only leaves have phloem,and only roots have xylem.
B) root cells have cell walls,and leaf cells do not.
C) leaves have mesophyll tissue,but roots do not.
D) vascular tissue is found in roots but is absent from leaves.
E) leaves have epidermal tissue,but roots do not.