Here's a problem to solve: 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?

Among the 4 following options, which is the correct answer?

- A: showing how a nearby town will avoid flooding
 
- B: explaining how the lake will be used for recreation
 
- C: explaining how some of the water can be used for agriculture
 
- D: showing how the dam will affect the plants and animals in the area
 