The next phase of the carbon cycle labeled A is : ( C ) Fossil fuel emissions
Carbon source
The carbon source labeled A consists of carbon, oil and gas therefore the next phase of the carbon cycle for this region is the emission of fossil fuel.
Photosynthesis phase of the carbon cycle occurs in green plants while ocean storage occurs in the ocean, also transpiration is the evaporation of water into the atmosphere through the leaves of plants therefore it occurs in green plants.
Hence we can conclude that The next phase of the carbon cycle labeled A is Fossil fuel emissions
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