设组合框Combol中有3个项目，则以下能删除最后一项的语句是 ______。

A．Static arrl(3)
arrl(1)=100
arrl(2)="Hello"
arrl(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 Base1
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

A．MouseDown
B．MouseUp
C．Load
D．Click