答案及解析：[单选题]在窗体上添加一个命令按钮Command1，编写代码如下： Function f(x As Integer) x = x + 3 f = x End Function Private Sub C

问题：

[单选题]在窗体上添加一个命令按钮Command1，编写代码如下：
Function f(x As Integer)
x = x + 3
f = x
End Function
Private Sub Command1_Click()
Dim a(10) As Integer
Dim x As Integer
For i = 1 To 10
a(i) = 8 + i
Next
x = 2
Print a(f(x) + x)
End Sub
程序运行后，单击命令按钮，显示结果为（）。
A.12
B.17
C.18
D.15