单项选择题

有以下程序: Option Base 1 Dimair()As Integer Private Sub Form_Click() Dimi As Integer,j As Integer ReDimalt(3,2) Fori=1 To 3 Forj=1 To 2 alt(i,j)=i*2+j Nextj Nexti ReDimPreservearr(3,4) Forj=3 To 4 alt(3,j)=j+9 Nextj Print arr(3,2);arr(3,4) End Sub 程序运行后,单击窗体,输出结果为( )。

A.8 13
B.0 13
C.7 12
D.0 0