Correct Answer: geothermal energy
Explanation:
Based on conventionality in deriving energy, energy sources could be classified as
Conventional ::
coal, oil, hydro, nuclear, etc... sources which can be used up or exhaustible.
(and)
Non - conventional ::
solar, wind, tidal, geothermal, biogas, etc... sources which are not exhausted.
Among the given options, Geothermal energy is the alternative energy source among all the choices that are given in the question, that is exhaustible.
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