For the reforestation of an area, the sides of a piece of land must be completely fenced with mesh, except for the side bordered by the river, as shown in the figure. Each roll of mesh that will be purchased for making the fence contains 48 meters in length.
The minimum quantity of rolls that should be purchased to fence this land is
(A) 6.
(B) 7.
(C) 8.
(D) 11.
(E) 12.