单项选择题

在窗体上画一个命令按钮,然后编写如下事件过程:
Private Sub Command1_Click( )
For i =1 To 4
x=4
For j = 1 To 3
x=3
For k = 1 To 2
x=x+6
Next
Next
Next
Print x
End Sub
程序运行后,单击命令按钮,输出的结果是

A.7
B.15
C.157
D.538