A heavy wooden block is dragged by a force F along a rough steel plate. The force is always of the same magnitude and always oriented parallel to the surface. In one setup, the block is pulled along a horizontal flat surface, and in another it is pulled up an incline. The normal force up the incline, as compared to the normal force along the horizontal surface is:
A. equal to the weight in both cases
B. greater
C. always less
D. less for some angles of the incline and greater for others
E. depends on the magnitude of force F