In which of the following processes is the least energy required?
- A$F_{(g)}^{-} \to F_{(g)} + e^{-}$
- B$P_{(g)}^{-} \to P_{(g)} + e^{-}$
- C$S_{(g)}^{-} \to S_{(g)} + e^{-}$
- D$Cl_{(g)}^{-} \to Cl_{(g)} + e^{-}$
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