单选题：A process will change its state from running to ready state when

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





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


答案：B