If the Following Two Reactions Were Coupled,what Would Be the Oxidizing

Multiple Choice

If the following two reactions were coupled,what would be the oxidizing agent for the spontaneous reaction?

NAD⁺ + H⁺ + 2e^- NADH $~~~~~~~~$$~~~~~~~~$ E ^$\circ$ ' = -0.32 V

Acetaldehyde + 2H⁺ + 2e^-
ethanol $~~~~~~~~$ E ^$\circ$ ' = -0.20 V

A) NAD⁺
B) acetaldehyde
C) NADH
D) ethanol
E) H⁺