The order of decreasing stability of the carbanions $(CH_3)_3 C^-(I) ; (CH_3)_2CH^{-1}(II) ; CH_3CH_2^{-}(III); C_6H_5CH_2^{-} (IV)$ is

Question

$(a)\;I > II > III > IV \\ (b)\;IV > III > II > I \\(c)\; IV > I > II > III \\ (d)\;I > II > IV > III $