Here's a problem to solve: Which is a problem with using wind turbines to produce energy?

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

- A: Wind turbines are efficient only in certain areas.
 
- B: Wind turbines occupy a small area of land.
 
- C: Wind turbines produce a large amount of energy.
 
- D: Wind turbines create a large amount of pollution.
 