A piece of paper is torn in half. Warmed air rises above a lit candle. A metal spoon gets warm when used to stir hot soup. Sunlight brightens a dark room.
Which example best demonstrates the process of conduction?

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

A metal spoon gets warm when used to stir hot soup.