Which phenomena release co2 into the atmosphere? a) forest fires b) decomposition of organic matter c) reforestation d) photsynthesis e) volcanic eruptions

Hello to answer your question.

A is correct
 But more likely forest fires would be the culprit because the trees produce O2
 so when the are burnt, it would be like everybody o this earth breathed out at   once causing CO2 to be released in to the atmostphere in a big burst

         Signed by, Virtuoso Sargedog

What are the choices

That is true it is called an aftershock