Solar energy is considered a viable alternative energy resource primarily for the following reasons:
B) It produces minimal air pollution.
Unlike fossil fuels, which release significant amounts of greenhouse gases and pollutants when burned, solar energy generation does not emit air pollutants during operation, making it an environmentally friendly energy source.
C) It has an endless supply.
The sun is a vast and consistent source of energy that will continue to shine for billions of years, making solar energy a renewable resource that can help sustain energy needs without depleting natural resources.
While options A and D mention relevant points related to energy resources, they are not strong reasons specific to solar energy. For example, option A suggests it costs "about nothing to harness," which can be misleading, as while the operational costs of solar energy are low, the initial installation can still be significant. Option D, relating to organic materials, is more applicable to bioenergy rather than solar energy.
In summary, the best answers regarding why solar energy is viable are B and C.