recycling aluminum cans. emptying waste baskets. wearing warmer clothes. eating all of their lunch.
I gave my students this multiple choice question: One way that students can help conserve natural resources at school is by

Only one answer is correct among these 4 choices:
- recycling aluminum cans.
- emptying waste baskets.
- wearing warmer clothes.
- eating all of their lunch.

Could you tell me which one is correct?

recycling aluminum cans.