单项选择题

下面正确使用动态数组的是( )。

A.Dim arr1() As Integer

ReDim arr1(3,5)
B.Dim arr1() As Integer

ReDim arr1(50) As String
C.Dim arr1()

ReDim arr1(50)As Integer
D.Dim arr1(50)As Integer

ReDim arr1(20)