Answer: D.Surface area
Explanation:
- Slant height is the distance along the lateral surface of a sold figure.
- Base area is the area of the base of the solid figure.
- Lateral surface area is the area of faces of a solid which does not include the area of the base or bases.
- The total area of the exterior surface which is know as surface area of a solid figure is the sum of the lateral surface area and the base area of that figure.
i.e.

Therefore, term which best describes the total area of the exterior surface of a solid figure is "Surface area" .