Here's a problem to solve: Some coal mining occurs underground and does not disturb the overlying land. How might coal mining that occurs underground be less harmful to the environment than surface mining?

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

- A: Underground coal mining increases pollution.
 
- B: Underground coal mining reduces habitat loss.
 
- C: Underground coal mining increases forest growth.
 
- D: Underground coal mining reduces animal populations.
 