Consider reactions A through F. Those carbon atoms undergoing change, as part of a functional group, are marked as `C^(12),C^(14)` or starred. In the cases shown, each carbon atom has either been reduced or oxidized. Your job is to identify the change in oxidation state that has occurred for each of the marked carbon.

Explanation

A : both are oxidized; B : `C^(12)` is reduced, `C^(14)` is oxidized; C : reduced; D : oxidized; E : `C^(12)` is reduced, `C^(14)` is oxidized; F : `C^(12)` is reduced, `C^(14)` is oxidized