Suppose the Critical Path is A$-$C$-$D$-$G$-$H$,$ the estimated probability that the project will be completed before $18$ weeks is $($round $z$ value to $2$ decimal places$)$

$66\mathrm{.}35\%$

$18\%$

$16\mathrm{.}35\%$

$33\mathrm{.}65\%$