a whole metal spoon getting hot when one end is in hot soup the inside of a car in the sun getting very hot a tar road getting hotter in the sun than a concrete sidewalk a fireplace fire heating a room on a cold day
I gave my students this multiple choice question: Which of the following is an example of heat transfer by conduction?

Only one answer is correct among these 4 choices:
- a whole metal spoon getting hot when one end is in hot soup
- the inside of a car in the sun getting very hot
- a tar road getting hotter in the sun than a concrete sidewalk
- a fireplace fire heating a room on a cold day

Could you tell me which one is correct?

a whole metal spoon getting hot when one end is in hot soup