The correct option is
D Epidermis of both dicot and monocot roots
Epidermis with root hairs is called epiblema or piliferous layer or rhizodermis. It is found in root hair region of the root. Root hairs are small, tubular, unicellular, epidermal out growths. It takes part in the absorption of water and minerals.
So, the correct option is 'Epidermis of both dicot and monocot roots'.