单选题：consider the following set of processes, with the length of the

consider the following set of processes, with the length of the CPU-burst time given in milliseconds, a smaller priority number implying a lower priority, the processes arriving in the order P1, P2, P3, P4,P5, all at time 0:
```
Process Burst time Priority
P1 8 3
P2 1 1
P3 2 4
P4 1 3
P5 4 2
```
Which is the most appropriate average waiting time using priority scheduling? @[C](1)
A. 12.5 ms
B. 3.5 ms
C. 7.6 ms
D. 11.5 ms




A.12.5 ms
B.3.5 ms
C.7.6 ms
D.11.5 ms


答案：C