在//point x处的声在句法上合法的是______。 class Person { private int a; public int change(int m){return m;} } public class Teacher extends Person { public int b; public static void main(String arg[]){ Person P=new Persor(); Teacher t=new Teacher(); int i; //point x } } A.i=m; B.i=b; C.i=p.a; D.i=p.change(30); E.i=t.b;