Answer:
I would say nuclear and/or other renewable sources such as hydro, solar, turbine.
Explanation:
Nuclear is the cleanest source of energy out there, and is one of the more efficient ways of energy. However, nuclear energy is also the riskiest. Events such as Chernobyl are examples of the dangers of nuclear power plants. The radioactive effects of a nuclear power plant detonating is long term and causes quite a bit of damage ecologically, biologically, and economically.
If it werent for the risk factor nuclear would be the best way of energy by far.
I think the answer is letter <span>d. fine-tune how the lens bends light.</span> Eye strain often happens when a person focuses his vision on a particular object. When Joel is reading, the glasses helps fine-tune the light before going into the retina. If Joel does not change his glasses, it would make his eyes focus more on the book, causing the eyes to strain even more
