下列各种形式的循环中，输出“*”的个数最少的循环是

A．a=5:b=8 Do Print" *" a=a+1 Loop While a＜b
B．a=5:b=8 Do Print" *" a=a+1 Loop Until a＜b
C．a=5:b=8 Do Until a-b Print "*" b=b+1 Loop
D．a=5:b=8 Do Until a＞b Print "*" a=a+1 Loop