单项选择题

现有程序如下：
Option Base 1
Private Sub Form_Click()
Dim x(5, 6)As Integer, y(5)As Integer
For i = 1 To 5
For j =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 j = 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( )。