Heat is a transfer of thermal energy from one object to anther because of a difference in?

I'm pretty sure the answer is c 

A=v^2/r solve for r hope that  

Gravity, from the center of mass of the box, extending downward normal force, from the floor under the box, extending upward, equal to gravity push force, acting at a point on the box, extending in the direction of motion friction, acting at any point on the box directly opposite the push, extending directly opposite to the motion

The answer would be true