Which one of the following reactions occurs at the anode in the Castner process of extracting sodium metal?
- A$H_2 \longrightarrow 2 H^{+} + 2 e^{-}$
- B$2 Cl^{-} \longrightarrow Cl_2 + 2 e^{-}$
- C$4 OH^{-} \longrightarrow 2 H_2 O + O_2 + 4 e^{-}$
- D$Na^{+} + e^{-} \longrightarrow Na$
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