找出下列程序中错误的代码 public class Test { public static void main(String[] args) { m(new GraduateStudent()); m(new Student()); m(new Pers

题目：找出下列程序中错误的代码 public class Test { public static void main(String[] args) { m(new GraduateStudent()); m(new Student()); m(new Person()); } public static void m(Student x) { System.out.println(x.toString()); } } class GraduateStudent extends Student { } class Student extends Person { public String toString() { return "Student"; } } class Person extends Object { public String toString() { return "Person"; } }

A. m(new Person())

B. m(new GraduateStudent())

C. m(new Student()

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