What is the decreasing order of nucleophilicity for $R_3C^{-}, R_2N^{-}, RO^{-},$ and $F^{-}$?
- A$R_3C^{-} > R_2N^{-} > RO^{-} > F^{-}$
- B$F^{-} > RO^{-} > R_2N^{-} > R_3C^{-}$
- C$RO^{-} > F^{-} > R_2N^{-} > R_3C^{-}$
- D$R_3C^{-} > RO^{-} > F^{-} > R_2N^{-}$
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