Which of the following is not a commercial source of energy? (1) Coal (2) Petroleum (3) Natural Gas (4) Firewood

Which of the following is not a commercial source of energy? (1) Coal (2) Petroleum (3) Natural Gas (4) Firewood
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(4) Firewood Explanation: Firewood, agricultural waste (straw, etc.) and animals waste (cowdung) are the important components of non-commercial energy. It is generally used in the rural area for domestic purposes— mainly cooking. Coal, petroleum products, natural gas and, electricity are the important components of commercial energy.
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Last Answer : form_title= Firewood form_header= Make a fire with firewood! How much firewood do you need?*= _ [50] Do you want the firewood split?*= () Yes () No How much storage do you have for firewood?*= _ [50]