In the Reaction in the Diagram Below, Pyruvate Is Converted

In the reaction in the diagram below, pyruvate is converted to acetyl-CoA. Which if any of the following statements concerning this reaction is TRUE?

A) CO₂ is the most oxidized and therefore least energetic form of carbon.
B) NAD⁺ is more reduced than NADH.
C) NAD⁺ is an oxidizing agent.
D) This is not an oxidation/reduction reaction; that is, no electrons have moved.
E) This reaction harnesses the last of the remaining potential energy from glucose.