Which of these is a disadvantage of hydroelectric energy ? A. Is expensive to build or maintain

B. Has high power plant efficiency

C. Has a long power plant life span

D. Reduces greenhouse gas emissions

A. Is expensive to build or maintain

Explanation:

Hydroelectric energy is a type of energy which is generated from the flow of water. In this energy, water is allowed to fall from a certain height on the turbine. The moving of turbine produces energy. The main disadvantage of hydroelectric energy is that it is very expensive and require high amount of money for the construction and maintenance of hydroelectric power plant. The machinery used for the production of hydroelectric energy is very costly.

it's not c. i took the quiz and got it wrong. so my best guess is b.

have a great day, and hope this .

the correct answer is d