Which of the following is a commercial source of energy? (1) Agricultural waste (2) Dried dung (3) Sun (4) Natural gas

Which of the following is a commercial source of energy? (1) Agricultural waste (2) Dried dung (3) Sun (4) Natural gas
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(4) Natural gas Explanation: Energy is broadly classified as commercial and non-commercial energy. Firewood, agricultural waste (straw, etc.) and animals waste (cowdung) are the important components of non-commercial energy. Coal, petroleum products, natural gas and, electricity are the important components of commercial energy. These goods are largely used for commercial purposes in the factories and farms.
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