Consider the following network. Activity $L$ has an activity time of $4$ and immediately precedes activities $M,P,$ and $T.$ The latest start times for activities $M,P,$ and $T$

are $22,19,$ and $27,$ respectively. The latest finish times for activities $M,P,$ and $T$ are $29,27,$ and $33,$ respectively. What is the latest start time for activity $L?$

A$.13$

B$.33$

C$.22$

D$.15$

E$.37$