A Person Is Pushing on a Box,exerting a Force of Magnitude

Multiple Choice

A person is pushing on a box,exerting a force of magnitude P,as shown in the figure.Earth exerts force W on the box.The push is directed at an angle θ below the horizontal,and the box remains at rest.The box rests on a horizontal floor that has some friction with the box.The friction force exerted by the floor on the box is equal to

A) P sin θ
B) P cos θ
C) 0
D) P cos θ + W
E) P + W