A$.$ When the block arrives at point C $($where it comes to a stop$)$ from point B at the bottom of the hill, $---$Select$---$kinetic$$gravitational potential$$spring potential$$electric potential$$thermal$$chemical energy has decreased and $---$Select$---$kinetic$$gravitational potential$$spring potential$$electric potential$$thermal$$chemical energy has increased.

Are there any external forces that transfer energy in or out of the system as work? $---$Select$---$yes$$no