程序段如下：
Private Sub Command1_ Click()
a = 0
for 1=15 To 15 Step- 2
a = a +1
Next I
Print a, I
End Sub
发生Command 1的单击事件后，程序的输出结果是 ______。

A．0 13
B．15 13
C．0 15
D．15 15

程序段如下：Private Sub Command1_ Click() a = 0 for 1=15 To 15 Step- 2 a = a +1 Next I Print a, IEnd Sub发生Command 1的单击事件后，程序的输出结果是 ______。