In a Fuel Cell Using Oxygen as the Oxidizer and Hydrogen

Multiple Choice

In a fuel cell using oxygen as the oxidizer and hydrogen as the fuel, what is the overall cell reaction?

A) H₂O $\rightarrow$ H₂ + O₂
B) 2 H₂ + O₂ $\rightarrow$ 2 H₂O
C) H₂O + 4 e^- $\rightarrow$ 2 H₂ + 4 OH^-
D) O2 + 4 H⁺ + 4 e^- $\rightarrow$ 2 H₂O