Which Pair of Half-Reactions Takes Place in a Fuel Cell $\rightarrow$

Multiple Choice

Which pair of half-reactions takes place in a fuel cell?

A) reduction: O₂ + 4 H⁺ + 4 e^- $\rightarrow$ 2H₂O; oxidation: H₂ $\rightarrow$ 2 H⁺ + 2 e^-
B) reduction: H₂ $\rightarrow$ 2 H⁺ + 2 e^-; oxidation: O₂ + 4 H⁺ + 4 e^- $\rightarrow$ 2 H₂O
C) reduction: O₂ + 4 H⁺ + 4 e^- $\rightarrow$ 2H₂O; oxidation: 2 H⁺ + 2 e^- $\rightarrow$ H₂
D) reduction: H₂ $\rightarrow$ 2 H⁺ + 2 e^-; oxidation: 2 H₂O $\rightarrow$ O₂ + 4H⁺ + 4 e^-