A coal furnace heating a house a windmill pumping water on a farm a kerosene lamp lighting a room a diesel truck traveling along a road
I gave my students this multiple choice question: A renewable energy source is a source that will not run out. Which is an example of the use of such a source?

Only one answer is correct among these 4 choices:
- A coal furnace heating a house
- a windmill pumping water on a farm
- a kerosene lamp lighting a room
- a diesel truck traveling along a road

Could you tell me which one is correct?

a windmill pumping water on a farm