sunlight warms soil. a ceiling fan blows air. flames heat up a pan. heat rises in a chimney.
I gave my students this multiple choice question: The best example of heat transfer by convection is when

Only one answer is correct among these 4 choices:
- sunlight warms soil.
- a ceiling fan blows air.
- flames heat up a pan.
- heat rises in a chimney.

Could you tell me which one is correct?

heat rises in a chimney.