[单选题]

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(By Val x as Integer, y as Integer)
C．Sub Proc(x as Integer, By Val y as Integer)
D．Sub Proc(By Val x as Integer, By Val y as Integer)

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(By Val x as Integer, y as Integer)C．Sub Proc(x as Integer, By Val y as Integer)D．Sub Proc(By Val x as Integer, By Val y as Integer)