A Fuel Cell Works on the Same Principle as a Battery

A fuel cell works on the same principle as a battery but is continually fed with fuel. In one fuel cell, methanol (CH₃OH) enters on one side of the unit, and air enters on the other side. Both circulate past electrodes, and a chemical reaction occurs that produces electricity plus carbon dioxide and water as byproducts. Which chemical reaction equation best represents the reaction that occurs in this fuel cell?

A) CH₃OH $\rightarrow$ CO₂ + H₂O
B) CH₃OH $\rightarrow$ CH₃ + OH
C) CH₃OH $\rightarrow$ CH₂ + H₂O
D) CH₃OH + O₂ $\rightarrow$ CO₂ + H₂O
E) 2CH₃OH + 3O₂ $\rightarrow$ 2CO₂ + 4H₂O