How can the carbon in sediments reach the atmosphere?

a. decomposition, fossil fuel formation, fossil fuel emissions

b. decomposition, diffusion, evaporation

c. cellular respiration, diffusion, transpiration

d. photosynthesis, organic carbon, cellular respiration

A. decomposition, fossil fuel formation, fossil fuel emission.

Decomposition is the process of degradation and decaying the plant and animal waste below the earth's sediments. This buried matter remain beneath the earth surface for million's of years as a result of this fossil fuels are produced. With the use of fossil fuels by human activity resulted in emission of fossil fuels in the earth atmosphere.

i believe it is "they are not used up by reactions" as the answer to your question, text me back if this is correct because i just learned this.