A Horizontal Force Is Used to Push an Object $\theta$

Multiple Choice

A horizontal force is used to push an object of mass m up an inclined plane. The angle between the plane and the horizontal is $\theta$ . The normal reaction force of the plane acting on the mass m is

A) mg cos $\theta$ + F cos $\theta$
B) mg cos $\theta$
C) mg cos $\theta$ + F sin $\theta$
D) mg cos $\theta$ - F cos $\theta$
E) impossible to determine because the coefficient of friction is not given.