cut down most of the trees from forests build more lumber mills reduce the amount of recycled paper plant a tree each time one is cut down
I gave my students this multiple choice question: Many products are made from trees. Which is the best way to manage the use of trees?

Only one answer is correct among these 4 choices:
- cut down most of the trees from forests
- build more lumber mills
- reduce the amount of recycled paper
- plant a tree each time one is cut down

Could you tell me which one is correct?

plant a tree each time one is cut down