请看如下代码 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 Person(); Teacher t = new Teacher(); int i; // point x } } 下面哪些放在// point x?行是正确的? A. i = m; B. i = b; C. i = p.a; D. i = p.change(3); E. i = t.b;