Discussion
The largest and potential reservoir of carbon is :
Answer: C
The largest reservoir of carbon among these is the oceans.
The oceans hold roughly 38,000 billion tonnes of carbon, mostly as dissolved inorganic carbon (bicarbonate and carbonate) in the deep water. That is about fifty times the carbon in the atmosphere and far more than in all land vegetation. They also take up about a quarter of the CO2 released by human activity each year, which makes them the main potential sink as well. (Sedimentary rocks hold more still, but they are not among the options.)
Forests and agricultural fields hold hundreds of billions of tonnes, and the atmosphere about 800 billion tonnes, each far less than the oceans.
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