Table 36 -Using Table 3

Table 3.6
$$\begin{array} { | c | c | c | } \hline \text { Activity } & \begin{array} { c } \text { Immediate } \\\text { Predecessor(s) }\end{array} & \begin{array} { c } \text { Time } \\\text { (weeks) }\end{array} \\\hline \text { A } & \cdots & 3 \\\text { B } & \cdots & 9 \\\text { C } & \cdots & 10 \\\\\text { D } & \text { A } & 4 \\\text { E } & \text { B } & 12 \\\text { F } & \text { C } & 5 \\\\\text { G } & \text { B,D } & 6 \\\text { H } & \text { E,F } & 7 \\\text { I } & \text { H } & 8 \\\hline\end{array}$$
-Using Table 3.6,what is the slack for activity G?

A) 9 weeks
B) 21 weeks
C) 23 weeks
D) 30 weeks