现有：     
class Pencil  { 
public void write （String content）{ 
System.out.println （"Write"+content）；     }     } 
class RubberPencil extends Pencil{     public void write （String content）{ 
System.out.println （"Rubber Write"+content）；     } 
public void erase （String content）{     System.out.println （"Erase "+content）；     }     }
执行下列代码的结果是哪项？（） 
Pencil pen=new RubberPencil（）；     
pen.write（"Hello"）；     

A.  Write Hello
B.  Rubber Write Hello
C.编译错误
D.运行时抛出异常