An analysis of flue gas resulting from the buring of coal shows $2\mathrm{.}3\%$ oxygen, $1\%$ car$-$

bon monoxide, $12\mathrm{.}7\%$ carbon dioxide, and $84\%$ nitrogen. Determine the maximum

theoretical percentage of CO$,$

C$.17\mathrm{.}111$

B$\mathrm{.}14\mathrm{.}281$

$1\mathrm{.}80\%$

D$\mathrm{.}25\mathrm{.}721$