单项选择题

有如下函数过程:
Function Fun(By Val x As Ingeger,ByVal y As Integer) As Integer
DO While …y<>0
reminder=x Mod y
x=y
y=reminder
Loop
Fun=x
End Function
以下是调用该函数的事件过程,该程序的运行结果是
Private Sub Command1_Click()
Dim a As Integer
Dim b As Integer
a=100:b=25
x=Fun(a,b)
Print x
End Sub
A) 0 B) 25 C) 50 D) 100