The best definition of alternative energy is energy that can be used in place of fossil fuels. The correct option is A.
What is alternative energy?
Alternative energy is that energies are used in the place of the conventional form of energy. These energies are renewable and eco-friendly.
The burning of coal and fossil fuel produces lots of greenhouse gases, so the best alternative energy is the one that replaces it.
Thus, the correct option is A. Energy sources can be used in place of fossil fuels.
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