单项选择题

设有如下程序
Sub f(x As Integer,ByVal y As Integer)
x=2*x
y=y+x
End Sub
Private Sub Command1_Click()
Dim a As Integer , b As Integer
a=6 ; b=35
call f(a,b)
print a,b
End Sub
程序运行后,单击命令按钮Command1,输出结果为()。

A.6 47
B.12 47
C.6 35
D.12 35