Energy Conservation with Conservative Forces: in the Figure, a Very

Energy conservation with conservative forces: In the figure, a very small toy race car of mass m is released from rest on the loop-the-loop track. If it is released at a height 2R above the floor, how high is it above the floor when it leaves the track, neglecting friction?

A) 1.67 R
B) 2.00 R
C) 1.50 R
D) 1.33 R
E) 1.25 R