Here's a problem to solve: Which example best demonstrates the process of conduction?

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

- A: A piece of paper is torn in half.
 
- B: Warmed air rises above a lit candle.
 
- C: A metal spoon gets warm when used to stir hot soup.
 
- D: Sunlight brightens a dark room.
 