Which of the following is NOT among the commercial sources of energy?
Show answer & explanation
Correct answer: C
Explanation
The correct answer is option 3 i.e. Fuel wood.
Fuelwood is primarily considered a non-commercial source of energy because it is often gathered directly by households from forests or agricultural waste, rather than being bought and sold in organized markets at a defined price. While some informal local markets for fuelwood exist, it generally doesn't contribute significantly to a country's formal energy economy or industrial processes like coal, oil, or electricity. Its usage is more indicative of a subsistence economy and rural livelihoods, rather than widespread commercial transactions.