What does a model of the carbon cycle show? A. The amount of Earth’s carbon is constant.

B. The amount of Earth’s carbon cannot be determined.

C. The amount of Earth’s carbon decreases.

D. The amount of Earth’s carbon increases.
I think its A

Changes that put carbon gases into the atmosphere result in warmer temperatures on Earth. This diagram of the fast carbon cycle shows the movement of carbon between land, atmosphere, and oceans. Yellow numbers are natural fluxes, and red are human contributions in gigatons of carbon per year.

what is the aerea shown

explanation: