makes the food hot enough to burn adds more oxygen needed for burning increases the amount of wood there is to burn provides the energy needed to keep the fire going
I gave my students this multiple choice question: Fanning can make a wood fire burn hotter because the fanning

Only one answer is correct among these 4 choices:
- makes the food hot enough to burn
- adds more oxygen needed for burning
- increases the amount of wood there is to burn
- provides the energy needed to keep the fire going

Could you tell me which one is correct?

adds more oxygen needed for burning