drain the water away flood the highest parts of the land leave the land alone use the land for planting crops
I gave my students this multiple choice question: A wetland habitat can continue to support the birds and fish that live there if people ___.

Only one answer is correct among these 4 choices:
- drain the water away
- flood the highest parts of the land
- leave the land alone
- use the land for planting crops

Could you tell me which one is correct?

leave the land alone