The correct option is C non-renewable
Non-renewable energy resources like coal, nuclear fuels, oil, etc. are available in limited supplies as these cannot be readily replaced by natural means at a quick enough pace to keep up with the consumption. Hence, overuse of these resources may lead to their depletion. On the other hand, renewable resources such as solar energy, wind energy, etc., are replenished naturally and over relatively short periods of time. Therefore, in order to sustain our resources for the future we should depend more on renewable source of energy.