Chemical Bonding · Lewis structures of isoelectronic species

The pairs among

A = [$\ce{SO3^2-}$, $\ce{CO3^2-}$], B = [$\ce{O2^2-}$, $\ce{F2}$], C = [$\ce{CN-}$, $\ce{CO}$], D = [$\ce{NH3}$, $\ce{H3O+}$] and E = [$\ce{MnO4^2-}$, $\ce{CrO4^2-}$] that do not have similar Lewis dot structure are :