What Is the Fastest Completion Time of the Project with Activity

Multiple Choice

What is the fastest completion time of the project with activity lengths (in days) and precedence requirements as shown in the table? $$\begin{array} { | c | c | c | } \hline \text { Activity } & \text { Length } & \text { Predecessor } \\\hline \text { A } & 15 & \cdots \\\hline \text { B } & 7 & \text { A } \\\hline \text { C } & 4 & \text { A } \\\hline \text { D } & 8 & \text { B, C } \\\hline\end{array}$$

A) 22
B) 25
C) 27
D) 30