Most CO2 from catabolism is released during

a. glycolysis.

b. the citric acid cycle.

c. lactate fermentation.

d. electron transport.

The correct answer is option b. "the citric acid cycle".

Explanation:

The citric acid cycle is one of the most important pathways of the cellular metabolism because of its role in energy production and biosynthesis. The citric acid cycle is where most of the CO2 from catabolism is released. This happens by the release of two molecules of CO2 per turn in the cycle, using the two atoms of carbon from acetyl CoA.