A Project Is Represented by the Activity Durations (Estimated at 90

A project is represented by the activity durations (estimated at 90% likelihood of completion) and precedence requirements shown in the table.What is the overall duration of this project if it is managed using critical chain methodology? $$\begin{array} { | l | l | l | l | l | l | } \hline \text { Activity } & \text { Predecessor } & \text { Length } & \text { Activity } & \text { Predecessor } & \text { Length } \\\hline \mathrm { M } & - & 8 & \mathrm { R } & - & 12 \\\hline \mathrm { N } & - & 8 & \mathrm {~S} & \mathrm { P } & 14 \\\hline \mathbb { P } & \mathbb { M } & 12 & \Gamma & \mathrm { R } , \mathrm { Q } & 7 \\\hline \mathrm { Q } & \mathbb { N } & 10 & \mathrm {~V} & \mathrm {~S} , \mathrm {~T} & 11 \\\hline\end{array}$$

A) 22.5
B) 24.75
C) 27.0
D) 33.75