Which of the following compounds undergoes solvolysis in aquoes ethanol most rapidly?

Question

$\begin {array} {1 1} (A)\;\text{Cyclo hexyl bromideabc} & \quad (B)\; \text{3 chloropentane} \\ (C)\;\text{3 iodo 3 methylpentane} & \quad (D)\;\text{methyliodide} \end {array}$