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Identify the commercial source of energy.

  • A.Firewood
  • B.Coal
  • C.Agricultural waste
  • D.Dried dung

Answer: B

Coal is the commercial source of energy. Commercial sources are those that are bought and sold in the market, such as coal, petroleum, natural gas and electricity. Firewood, agricultural waste and dried dung are non-commercial (traditional) sources because they are collected and used locally and are normally not traded in the market. So of the four, only coal belongs to the commercial group.

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