以下关于变量类型说明符的使用正确的是 ( )

A) Static arr1(3)Arr1(1)=100
arr1(2)="Hello"
arr1(3)=123.45
B) Dim arr2()As Integer
Dim size As Integer
Private Sub Command2_Click()
size=InputBox("输入:")
ReDimarr2(size)
......
End Sub
C) Option Base 1
Private Sub Command3_Click()
Dim arr3(3)As Integer
......
End Sub
D) Dim n As Integer
Private Sub Command4_Click()
Dim arr4(n)As Integer
......
End Sub