public class Pet{  <br /> private String name;  <br /> public Pet(){  <br /> System.out.print(1);  }  <br /> public Pet(String name){  <br /> System.out.print(2);  }  }  <br /> public class Dog extends Pet{  public Dog(){  <br /> System.out.print(4);  }  <br /> public Dog(String name){  <br /> super(name);  <br /> System.out.print(3);  }  <br /> }  <br /> 执行new Dog(“棕熊”);后程序输出是哪项?() 
A、 33
B、 13
C、 23
D、 123