单项选择题

程序代码如下,当单击窗体上的Command1控件时,窗体上输出的结果是( )。
Private Sub Command1_Click()
Dim Y As Integer,I As Integer
Dim A(7)As Integer
Y=18:I=0
Do
A(I)=Y Mod 2
I=I+1
Y=Y\2
Loop Until Y<1
For j=I-1 To 0 Step-1
Print A(j);
Next j
End Sub

A.1 0 0 0
B.1 0 0 1 0
C.0 0 1 1 0
D.1 0 1 0 0