要想在过程Proc调用后返回形参x和y的变化结果，下列定义语句中正确的是( )。

A．Sub Proc(x as Integer，y as Integer)
B．Sub Proc(ByVal x as Integer，y as Integer)
C．Sub Proc(x as Integer，ByVal y as Integer)
D．Sub Proc(ByVal x as Integer，ByVal y as Integer)