recycle the markers, reuse the milk cartons reuse the markers, discard the milk cartons discard the markers, reuse the milk cartons reuse the markers, recycle the milk cartons
I gave my students this multiple choice question: In an experiment studying phototropism, students grew bean plants in labeled cardboard milk cartons. Afterward, the plants and soil were properly discarded. Which instruction line BEST conserves the remaining resources?

Only one answer is correct among these 4 choices:
- recycle the markers, reuse the milk cartons
- reuse the markers, discard the milk cartons
- discard the markers, reuse the milk cartons
- reuse the markers, recycle the milk cartons

Could you tell me which one is correct?

reuse the markers, recycle the milk cartons