Decomposition is the process by which: Carbon atoms are released into the soil
Carbon is converted to CO2
Organisms obtain energy by breaking down glucose

Decomposition is the process by which carbon atoms are released into the soil.

Explanation:

Organic decomposition involves the process of degradation of a living organism by releasing its elemental components.

In the process of decomposition, chemical elements such as carbon are released mainly in the soil, contributing to its enrichment and use by other living beings.

The release of carbon —product of decomposition— to the soil, for recycling, is part of the carbon cycle.

The other options are not correct because: