现有：  class Wrench f  public static void main（String  []  args）  {  Wrench w=new Wrench（）；    Wrench w2=new Wrench（）；     w2=go （w， w2）；      System.out.print （w2==w）；      }  static Wrench go （Wrench wrl，  Wrench wr2）  {     Wrench wr3=wrl； wrl=wr2； wr2=wr3；     return wr3；      }       结果是什么？（）     

• A、 false
• B、 true
• C、编译失败
• D、运行的时候有异常抛出