A Solid Ball Having a Mass of 2 $\theta$ = 51º with the Horizontal

Multiple Choice

A solid ball having a mass of 2.6 kg and a radius of 0.2 m is placed at the top of an incline. The incline makes an angle of $\theta$ = 51º with the horizontal. The ball is then released and rolls without slipping down the incline. The frictional force that the incline exerts on the (rolling) ball is

A) 20 N.
B) 5.7 N.
C) 7.9 N.
D) 0.0 N.