Which of the following correctly represents the $+I$ effect of the substituents :

Question

$(a)\; O^- > COO^{-} > CR_3 \\(b)\; COO > O ^- > CR_3 \\(c)\;O^- < COO^{-} < CR_3  \\ (d)\; COO^{-} < O^{-} < CR_3 $