Which given halide does not undergo SN1 reaction

1. A.
   $\left( CH_{3} \right)_{3}C -Cl$ (tert-butyl chloride)
2. B.
   $CH_{2}=CH -CH_{2}-Cl$ (allyl chloride)
3. C.
   1-chlorobicyclo[2.2.1]heptane (chlorine at the bridgehead carbon)
4. D.
   $C_{6}H_{5}-CHCl -CH_{3}$ (1-chloro-1-phenylethane)

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1. A.
   (A), (B) and (D) only
2. B.
   (A) and (B) only
3. C.
   (B) and (C) only
4. D.
   (B) only

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