using low energy appliances washing and reusing plastic cups using empty milk cartons as flower planters using aluminum cans to make new products
I gave my students this multiple choice question: Which is the best example of recycling?

Only one answer is correct among these 4 choices:
- using low energy appliances
- washing and reusing plastic cups
- using empty milk cartons as flower planters
- using aluminum cans to make new products

Could you tell me which one is correct?

using aluminum cans to make new products