Answer:
Option A, movement of carbon from one reservoir to another
Explanation:
Carbon flux is defined as the exchange of carbon between different sources of carbon termed as carbon pool or reservoir. The carbon is exchanged between different carbon pools through the process of combustion, liquefaction, respiration, phosynthesise, dissolution, decomposition etc. The carbon flux at global level is measured in gigatonnes and is also sometimes referred to as carbon cycle where carbon is exchanged between different environment components in different forms
