某VB程序的一个事件过程如下：
Private Sub Commandl_Click()
Dim i As Integer,j As Integer.s As String
Dim a(1 To 5) As Integer
List1.Clear
Randomize
For i="1" To 10
j="Int(Rnd*6)+1"
a(j)=a(j)+1
Next i
For i="1" To 5
s=Str(a(i))
List1.AddItem s
Next i
End Sub
程序运行时，单击按钮Commandl后弹出如图所示的错误提示。出现错误的语句是(  )

A．j=Int(Rnd*6)+1	B．a(j)=a(j)+1
C．s=Str(a(i))	D．List1.AddItem s