Power is produced inexpensively. Air pollution is produced. Oil spills may occur. The local ecosystem may be disrupted.
I am hesitating between 4 options to answer the following question, which option should I choose?
Question: What is a disadvantage of using moving water to produce electricity?
Possibilities:
- Power is produced inexpensively.
- Air pollution is produced.
- Oil spills may occur.
- The local ecosystem may be disrupted.

The local ecosystem may be disrupted.