You Are Responsible for Managing a Project with the Following

You are responsible for managing a project with the following activities (times are given in weeks) :
$\begin{array}{cccccc}&\text { Immediate } & \text { Normal Time } & \text { Crash Time } & \text { Normal } & \text { Crash } \\\text { Activity }&\text { Predecessor } & \text { (Weeks) } & \text { (Weeks) } & \text { Cost }(\$) & \text { Cost }(\$) \\\hline\text { A } & \text { none } & 3 & 2 & \$ 14,000 & \$ 16,500 \\\text { B } & \text { none } & 6 & 6 & \$ 5,500 & \$ 5,500 \\\text { C } & \text { none } & 2 & 1 & \$ 6,000 & \$ 8,000 \\\text { D } & \text { A } & 5 & 3 & \$ 7,500 & \$ 14,500 \\\text { E } & \text { C } & 2 & 1 & \$ 9,000 & \$ 10,500 \\\text { F } & \text { A } & 7 & 6 & \$ 15,000 & \$ 18,000 \\\text { G } & \text { B. D. E. F } & 4 & 3 & \$ 8,400 & \$ 10,000\end{array}$
-What activity should one crash to reduce the project completion time by two weeks at minimum crash costs?

A) A and F.
B) A and G.
C) A and E.
D) G and F.