在窗体上画一个名称为 Command1的命令按钮,然后编写如下事件过程: Private Sub Command1_Click()Dim a(4)As Integer, x As Integer, sum As Integern = 4: sum = 0a (1) = 1For k = 0 To n - 1 For i = 1 To k + 1 x = k + 2 - i a(x)= a(x)+ a(x - 1) If x < n - k Then Exit For sum = sum + a(x) Next iNext kPrint sum End Sub 程序运行后,单击命令按钮,则窗体上显示的内容是
A.5
B.6
C.8
D.11