The fastest SN1 reaction is of the followings:

• A. MeO - CH2 - Cl
• B. Me - CH2 - Cl
• C. \(\begin{array}{*{20}{c}} \rm O \ \ \ \ \ \ \ \ \ \\ {||} \ \ \ \ \ \ \ \ \ \\ {\rm Me - C - CH - Cl} \end{array}\)
• D. Ph - CH2 - CH2 - Cl