Only b and c involved in the redox reaction.
what is redox reaction ?
The term "redox reaction" refers to the oxidation-reduction process that happens on the surface of metals. This is the accumulation and transfer of electrons that occurs when two different atoms connect, most notably in ionic bonding. These two reactions happen at the same time and are known to be inseparable – as one atom loses an electron, the other acquires one, completing the redox cycle. Half-reactions occur when the reactions occur separately. The redox equation is the result of combining the half-reaction equations.
The citric acid cycle and the electron transport chain are the redox reactions among the given options
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