Decarboxylation is not involved in

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(B) Decarboxylation is the process of removing a carboxyl group from a compound,usually releasing $CO_2$.In $Glycolysis$,glucose $(6C)$ is broken down

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Glycolysis

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(B) Decarboxylation is the process of removing a carboxyl group from a compound,usually releasing $CO_2$.In $Glycolysis$,glucose $(6C)$ is broken down into two molecules of pyruvate $(3C)$. There is no loss of carbon atoms in this pathway,so decarboxylation does not occur.In $Kreb's 	ext{ cycle}$,decarboxylation occurs at two steps (isocitrate to $\alpha$-ketoglutarate and $\alpha$-ketoglutarate to succinyl-$CoA$).In $Alcoholic 	ext{ fermentation}$,pyruvate is converted to acetaldehyde and then to ethanol,releasing $CO_2$ during the first step.In the $Electron 	ext{ transport system}$,the process involves redox reactions and oxidative phosphorylation,not decarboxylation.

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