A spherical ball of mass \( m \) and radius \( r \) is released from rest from top of an incline at a height \( h \) above the ground, as shown in the figure. It rolls down the incline without slipping. How much rotational work is done by the friction on the cylinder \( \left(W_{\text {friction }}^{\text {rot }} ight) \) until it reaches the bottom of the incline? A) \( 2 m g h / 7 \) B) \( 2 m g h / 5 \) C) \( 3 m g h / 5 \) D) Zero