单选题：A process will change its state from “waiting” to “ready” when _

A process will change its state from “waiting” to “ready” when _____. @[B](1)
A. it has been selected for execution by scheduler
B. the event it had been waiting for has occurred
C. its time slice is finished
D. it waits for some event





A.it has been selected for execution by scheduler
B.the event it had been waiting for has occurred
C.its time slice is finished
D.it waits for some event


答案：B