a bell ringing in a tower a leaf falling from a tree a ball rolling down a hill a flag moving in the wind
I gave my students this multiple choice question: Which best demonstrates that waves transfer energy?

Only one answer is correct among these 4 choices:
- a bell ringing in a tower
- a leaf falling from a tree
- a ball rolling down a hill
- a flag moving in the wind

Could you tell me which one is correct?

a bell ringing in a tower