Which one is most reactive towards `S_(N^(1))` reaction?

Which one is most reactive towards `S_(N^(1))` reaction?
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Which one is most reactive towards `S_(N^(1))` reaction? A. `C_(6)H_(5)CH(C_(6)H_(5))Br` B. `C_(6)H_(5) ... H_(5)CH(CH_(3))Br` D. `C_(6)H_(5)CH_(2)Br`
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Which of the following alkyl halides is hydrolysed by `S_(N^(1))` mechanism?

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