单选题 现有程序如下：
Option Base 1
Private Sub Form_Click()
Dim x(5, 6) As Integer, y(5)As Integer
For j=1 To 5
For i=1 To 6
x(i, j)=Int(Rnd*9+1)
Next j
Next i
Call f(5, 6, x, y)
For i=1 To 5
Print y(i);
Next i
End Sub
Sub f(m As Integer, n As Integer, a() As Integer, b() As Integer)
For i=1 To m
b(i)=0
For i=1 To n
b(i)=b(i)+a(i, j)
Next j
Next i
End Sub
关于上述程序，以下叙述中正确的是