Here's a problem to solve: A block of ice is placed on a hot sidewalk. The ice melts because

Among the 4 following options, which is the correct answer?

- A: the energy from the ice flows to the sidewalk.
 
- B: the energy from the sidewalk flows to the ice.
 
- C: convection currents flow between the ice and the sidewalk.
 
- D: radiation flows between the ice and the sidewalk.
 