Answer:
To be honest I am not 100% on the answer. But to my knowledge (A) would probably be your best bet.
Step-by-step explanation:
Building a hydroelectric power plant has very little impact on the surrounding environment. 'It is known that hydropower projects have impacts on the environment. Change in hydrological flow regimes, deteriorating water quality, migration corridors barriers, sedimentation, greenhouse gas emission, and biodiversity loss are environmental impacts of hydropower projects"
Hydroelectric power plants require high levels of maintenance. Is this even close to being a benefit?
Hydroelectric power helps purify water that passes through it. Honestly could be the answer but as some faults.
Hydroelectric power is a cheap and renewable source of electricity. "Hydropower is an affordable source of electricity that costs less than most. Since hydropower relies only on the energy from moving water, states that get the majority of their electricity from hydropower, like Idaho, Washington, and Oregon, have lower energy bills than the rest of the country."