有程序如下:
Sub subP(b() As Integer)
For i=1 To 4
b(i)=2*i
Next i
End Sub
Private Sub Command1_Click()
Dim a(1 To 4) As Integer
a(1)=5
a(2)=6
a(3)=7
a(4)=8
subP a()
For i=1 To 4
Print a(i)
Next i
End Sub
运行上面程序，单击命令按钮，输出结果为______ 。

A．2
4
6
8

B．5
2
2
2

C．10
12
14
16

D．出错