A European company built a solar airplane, as shown in the figure, aiming to go around the world using only solar energy. The solar airplane has length $AB$ equal to 20 m and a wing span $CD$ equal to 60 m.
For a science fair, a team of students made a scale model of this airplane. The scale used by the students was $3 : 400$.
The wing span $CD$ in the said model, in centimeters, is equal to
(A) 5.
(B) 20.
(C) 45.
(D) 55.
(E) 80.