单选题：Consider the following five processes, with the length of CPU bu

Consider the following five processes, with the length of CPU burst in milliseconds and priority number (the smaller number means the higher priority) given below. Assume the five processes arrived with the order P1, P2, P3, P4, P5.
```
Process CPU burst time Priority
P1 10 3
P2 1 1
P3 2 3
P4 1 4
P5 5 2
```
If the system uses non-preemptive priority scheduling algorithm, which process has the longest turnaround time ? @[C](1)
A. P1
B. P3
C. P4
D. P5





A.P1
B.P3
C.P4
D.P5


答案：C