showing how a nearby town will avoid flooding explaining how the lake will be used for recreation explaining how some of the water can be used for agriculture showing how the dam will affect the plants and animals in the area
I gave my students this multiple choice question: Members of a planning team build a model of a nearby stream and then block the stream to show how it can form a lake. Which is a limitation of the model?

Only one answer is correct among these 4 choices:
- showing how a nearby town will avoid flooding
- explaining how the lake will be used for recreation
- explaining how some of the water can be used for agriculture
- showing how the dam will affect the plants and animals in the area

Could you tell me which one is correct?

showing how the dam will affect the plants and animals in the area