单项选择题

下面程序段,运行后的结果是
Private Sub Command1_Click()
Dim b%(1 To 4),i%,t#
  For i=1 To 4
    b(i) =i
  Next
  t=Tof(b() )
  Print"t=";t,
End Sub
Function Tof(a() As Integer)
Dim t#,i%
  t=1
  For i=2 To UBound(

A.
  t=t*a(