coffee warming a cup hot air warming a room the sun warming the moon a hot plate warming a beaker
I gave my students this multiple choice question: Heat is transferred from one object to another object. What is an example of heat transferred by radiation?

Only one answer is correct among these 4 choices:
- coffee warming a cup
- hot air warming a room
- the sun warming the moon
- a hot plate warming a beaker

Could you tell me which one is correct?

the sun warming the moon