单选题：When ______, a process will change from running state to ready s

When ______, a process will change from running state to ready state. @[A](1)
A. its time slice is over
B. it is selected by the scheduler
C. waiting an event
D. the waiting event occurs





A.its time slice is over
B.it is selected by the scheduler
C.waiting an event
D.the waiting event occurs


答案：A