Question

which of these is an advantage of hydropower? a. it is available only in limited areas. b. it harms aquatic organisms. c. it is expensive to build and maintain. d. it has a long power - plant life span.

Explanation:

• Option A: Being available only in limited areas is a disadvantage, not an advantage.
• Option B: Harming aquatic organisms is a negative impact, so it's not an advantage.
• Option C: High cost of building and maintaining is a drawback.
• Option D: A long power - plant life span is a positive aspect (advantage) as it means more reliable and long - term energy production.

Answer:

D. It has a long power - plant life span.