A Project Consists of Four Activities with Information as Shown

Multiple Choice

A project consists of four activities with information as shown in the table.What is the overall variance of the project? $$\begin{array} { | l | l | l | l | } \hline \text { Activity } & \text { Predecessor } & \text { Length } & \text { Variance } \\\hline \mathrm {A } & - - & 10 & 4 \\\hline\mathrm { B} &\mathrm {A } & 12 & 3 \\\hline \mathrm { C } & \mathrm { B } & 16 & 5 \\\hline \mathrm { D } & \mathrm { C } & 14 & 6 \\\hline \end{array}$$

A) 4.24
B) 8.41
C) 18
D) 24