$CH_3Br +Nu^{-} \longrightarrow CH_3 -Nu +Br^{-}$ The decreasing order of the rate of the above reaction with nucleophiles $(NU)$ A to D is $[Nu^{-}=\quad (A)\; Pho^{-},\;(B)\;AcO^- ,\; (C)\; HO^{-},\; (D)\;CH_3O^{-}]$

Question

$(a) D > C > A > B \\ (b)\; D > C > B > A \\ (c) A > B > C > D \\ (d)B > D > C > A$