Question

which of these is an advantage of hydroelectric energy?
a. is a renewable energy source
b. harms aquatic organisms
c. is expensive to build or maintain
d. is available in limited areas

Explanation:

Hydroelectric energy is generated from water, which is a renewable resource. Options B, C, and D are disadvantages. Option B (harms aquatic organisms) is an environmental drawback. Option C (expensive to build or maintain) is a cost - related disadvantage. Option D (available in limited areas) is a geographical limitation. Only option A (is a renewable energy source) is an advantage.

Answer:

A. Is a renewable energy source