Which of the following is an example of an $S_N2$ reaction?
- A$CH_3-Br + OH^{-} \rightarrow CH_3-OH + Br^{-}$
- B$CH_3-CH(Br)-CH_3 + OH^{-} \rightarrow CH_3-CH(OH)-CH_3 + Br^{-}$
- C$CH_3-CH_2-OH \xrightarrow{-H_2O} CH_2=CH_2$
- D$CH_3-C(CH_3)(Br)-CH_3 + OH^{-} \rightarrow CH_3-C(CH_3)(OH)-CH_3 + Br^{-}$
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