A 32-Kg Mass Is Placed at the Top of a Rough

A 3.2-kg mass is placed at the top of a rough incline( $\mu = 0.1$ ) . The incline makes an angle of 32º with the horizontal, and the height of the incline is 2.5 m. The gravitational potential energy of the mass at the top of the incline is

A) 55 J.
B) 78 J.
C) 46 J.
D) 36 J.