Whenahoteloverbooksasell-outdate,itistakingtheriskthat（）
A.moreguestswillunder-staythanthenumberofroomsbywhichthehotelhasoverbooked
B.moreguestswillcancelthanthenumberofroomsbywhichthehotelhasoverbooked
C.moreguestswillno-showthanthenumberofroomsbywhichthehotelhasoverbooked
D.alloftheabove
正确答案：D