单击命令按钮时，下列程度段的执行结果是( )。
Pdvate Sub Command1_Clik()
Dim a As Integer,b As Integer,c As Integer
a=2;b=4;c=6
CaII S1(a,b)
Print"a=";"b=";b;"c=";c
Call S2(a,b)
Print"a=";a;"b=";b;"c=";c;
End Sub
Private Sub S1(x As Integer,y As Integer)
Dim c As Integer
x=2*x:y=y+2:c=x+y
End Sub
Sub S2(x As Integer,ByVal y As Integer)
Dim e As Integer
x=2*x:y=y+2:e=x+y
End Sub
A．a=4 b=6 c=6
a=4 b=6 c=6
B．a=8 b=6 c=6
a=8 b=6 c=6
C．a=4 b=6 c=6
a=8 b=6 c=6
D．a=8 b=6 c=6
a=4 b=6 c=6
