carpooling to work composting grass clippings using a solar-powered calculator watering the lawn in the morning
I gave my students this multiple choice question: Which activity is an example of conserving nonrenewable resources?

Only one answer is correct among these 4 choices:
- carpooling to work
- composting grass clippings
- using a solar-powered calculator
- watering the lawn in the morning

Could you tell me which one is correct?

carpooling to work