Based on the Half Reactions Given Below, Which of the Following

Based on the half reactions given below, which of the following reactants is the strongest reducing agent?

A) NADH $\rarr$ NAD⁺ + H⁺ + 2e^- (E ^$\circ$ ' = + 0.32 V)
B) dihydrolipoic acid $\rarr$ lipoic acid + 2H⁺ + 2e^- (E ^$\circ$ ' = + 0.29 V)
C) FADH₂ $\rarr$ FAD + 2H⁺ + 2e^- (E ^$\circ$ ' = + 0.22 V)
D) lactate $\rarr$ pyruvate + 2H⁺ + 2e^- (E ^$\circ$ ' = + 0.18 V)
E) succinate $\rarr$ fumarate + 2H⁺ + 2e^- (E ^$\circ$ ' = - 0.03 V)