turning off lights using public transportation throwing away aluminum cans opening windows to cool a house
I gave my students this multiple choice question: As the human population grows, the demand for natural resources increases. Which activity wastes a natural resource?

Only one answer is correct among these 4 choices:
- turning off lights
- using public transportation
- throwing away aluminum cans
- opening windows to cool a house

Could you tell me which one is correct?

throwing away aluminum cans