哪一组A-B两段程序代码插入左边的类中可以通过编译并执行出下

public class MonsterTestDrive {
  public static void main(String [] args) {
    Monster [] ma = new Monster[3];
    ma[0] = new Vampire();
    ma[1] = new Dragon();
    ma[2] = new Monster();
    for(int x = 0; x < 3; x++) {
      ma[x].frighten(x);
    }
  }
}
class Monster {
A
}
class Vampire extends Monster {
B
}
class Dragon extends Monster {
  boolean frighten(int degree) {
    System.out.println("breath fire");
    return ture;
  }
}

boolean frighten(int d) {
  System.out.println("arrrgh");
  return ture;
}

boolean frighten(int x) {
  System.out.println("a bite?");
  return false;
}

boolean frighten(int x) {
  System.out.println("arrrgh");
  return ture;
}

int frighten(int f) {
  System.out.println("a bite?");
  return l;
}

boolean frighten(int x) {
  System.out.println("arrrgh");
  return false;
}

boolean scare(int x) {
  System.out.println("a bite?");
  return ture;
}

boolean frighten(int z) {
  System.out.println("arrrgh");
  return ture;
}

boolean frighten(byte b) {
  System.out.println("a bite?");
  return ture;
}