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B
Iron
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C
Magnesium
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D
Coal
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Solution
The correct option is B Coal Fossil fuel is a general term for buried combustible geologic deposits of organic materials, formed from decayed plants and animals that have been converted to crude oil, coal, natural gas, or heavy oils by exposure to heat and pressure in the earth's crust over hundreds of millions of years. So, coal is considered as the main fossil fuel which is used for the production of the electricity. Elements don't come under the fossil fuels as they are naturally present in the soil and were formed during the formation of the earth. So, copper, iron, magnesium are not fossil fuels.