If we need to apply a force of \( 10 N \) to just push a block up a rough inclined plane and \( 6 N \) to just push the same block down the same inclined plane, what approximate force is required to push it up the plane by applying a horizontal force ?
(A) \( 10 N \)
(B) \( 15 N \)
(C) \( 20 N \)
(D) Not possible to move
