Which Redox Reaction(s) Will NOT Proceed as Written If the Initial

Multiple Choice

Which redox reaction(s) will NOT proceed as written if the initial concentrations of reactants and products are equal? I. pyruvate + NADH $\rightarrow$ lactate + NAD⁺
II. FADH₂ + NAD⁺ $\rightarrow$ FAD + NADH + H⁺
III. succinate + NAD⁺ $\rightarrow$ fumarate + NADH + H⁺
IV. NADH + H⁺ + ubiquinone $\rightarrow$ NAD⁺ + ubiquinol
V. cytochrome c-Fe³⁺ + cytochrome b-Fe²⁺ $\rightarrow$ cytochrome c-Fe²⁺ + cytochrome b-Fe³⁺

A) I and IV
B) I, IV, and V
C) II
D) II and III
E) IV and V