fueling a car with gas heating a house with oil flying a kite in the wind grilling food over charcoal
I gave my students this multiple choice question: Anne's project for the science fair is about renewable energy. She wants to describe an activity that uses a renewable source of energy. Which activity should she describe in her project?

Only one answer is correct among these 4 choices:
- fueling a car with gas
- heating a house with oil
- flying a kite in the wind
- grilling food over charcoal

Could you tell me which one is correct?

flying a kite in the wind