Arrange the following compounds in order of reactivity towards $SN^1$ displacement.\[\] 1) 2 –Bromo-2-methylbutane \[\] 2) 1–Bromopentane \[\] 3) 2–Bromopentane

Question

$\begin {array} {1 1} (A)\;1>3>2 & \quad (B)\;2>3>1 \\ (C)\;1>2>3 & \quad (D)\;3>2>1 \end {array}$