From the options The Largest carbon reservoirs on earth is : ( A ) Limestone
The Largest carbon reservoirs on earth includes the Earth crust ,Oceans and fossil fuels. Limestone makes up about 15% of the earth's crust ( sedimentary ) therefore it is the largest carbon reservoir out of all the options given above.
Limestones are used as raw materials for the production of cement and other building/construction materials.
The Earth crust contains about 50,000,000 g/tons of Carbon in total while the oceans contain about 40,000 g/tons of carbon which is followed by Fossil fuels at 10,000 g/tons
Hence we can conclude that the Largest carbon reservoir is Limestone
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