In a chemical reaction, glyceraldehyde-3-phosphate + NAD+ yields 1,3-bisphosphoglycerate + NADH. In this reaction, what happened to NAD+?
A. It served as an enzyme to catalyze the reaction, and at the end of the reaction formed NADH
B. It was oxidized to form NADH
C. It was activated to form NADH
D. It was reduced to form NADH
Answer: D
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