$-12.$

$2CO(g)+O_2^{\text{'}}(g)2C{O}_2(g)$

$2\mathrm{.}0$mol of $CO(g)$ and $2\mathrm{.}0$mol of $O_2(g)$ are pumped into a rigid, evacuated $4\mathrm{.}0L$ container, where they react to form $C{O}_2(g),$ as shown above. Which of the following values does NOT represent a potential set of concentrations for each gas at a given point during the reaction?