Which of the following reaction takes place at anode in hydrogen-oxygen fuel cell?

• A. \(H_2+\frac{1}{2} O_2 \rightarrow H_2 O\)
• B. \(H_2 O \rightarrow H_2+ O_2\)
• C. \(H_2+2OH^-\rightarrow 2H_2 O+ 2e^-\)
• D. \(O_2+H_2 O+ 2e^-\rightarrow HO_2^-+ OH^-\)