A \( 2CO_2+O_2+4e\ \rightarrow\ 2CO_3^{2-} \)
B \( O_2+4H^++4e\ \rightarrow\ 2H_2O \)
C \( 2H_2\ \rightarrow\ 4H^++2e \)
D \( \frac{1}{2}O_2+2H^+ +2e\ \rightarrow\ H_2O \)
Correct Answer: Option D
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