The answer option which is considered to be the largest carbon reservoir is: C. fossil fuels.
Carbon can be defined as a non-metallic and tetravalent chemical element that is represented with the chemical symbol "C" and it has an atomic number of six (6).
This ultimately implies that, carbon is found in Group 6 on the periodic table because it has six (6) valence electrons, which are found in the outermost shell of its atomic nucleus.
Based on scientific records, the oceans are considered to be the largest carbon reservoir, followed by the geological reserves of fossil fuels.
In this context, fossil fuels are considered to be the largest carbon reservoir.
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