单选题：When ________,the process may change from waiting state to ready

When ________,the process may change from waiting state to ready state.@[B](1)
A. the time slice is over
B. the I/O completes
C. interruption happens
D. none of the above





A.the time slice is over
B.the I/O completes
C.interruption happens
D.none of the above


答案：B