Natural gas burns more cleanly than oil does and is denoted as option C.
This is referred to as a type of hydrocarbon containing material which is formed naturally in the Earth's crust from the remains of dead plants and animals and examples include coal, natural gas etc.
Natural gas has one of the cleanest sources of energy when compared with other fossil fuel types and it is known to burn more cleanly than oil does because carbon emissions are usually at a very minimal amount which is therefore the reason why it was chosen as the correct choice.
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