Here's a problem to solve: Anya placed an ice cube on the sidewalk on a warm day. The ice cube soon melted to form a puddle. What process caused the ice cube to melt?

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

- A: Heat transferred through the ice cube by convection.
 
- B: Heat transferred from the air to the ice cube by radiation.
 
- C: Heat transferred from the air and the pavement by conduction.
 
- D: Heat transferred through the ice cube into the pavement by conduction.
 