What Is the Early Finish Time for Activity F Given

Multiple Choice

What is the early finish time for Activity F given the activity times and precedence requirements shown in the table? $$\begin{array} { | l | l | l | } \hline \text { Activity } & \text { Time } & \text { Predecessor } \\\hline \text { A } & 5 & -- \\\hline B & 7 & -- \\\hline \mathrm { C } & 8 & \text { A } \\\hline \mathrm { D } & 7 & \text { A } \\\hline \mathrm { E } & 4 & \mathrm {~B} \\\hline \mathrm { F } & 8 & \mathrm { C } , \mathrm { D } \\\hline \mathrm { G } & \mathrm { 9 } & \mathrm { E } , \mathrm { F } \\\hline \mathrm { H } & 7 & \mathrm { G } \\\hline\end{array}$$

A) 15
B) 17
C) 19
D) 21