public class X {   public object m （） {   object o = new float （3.14F）；   object oa = new object [1]；   oa[0]= o；   o = null；   oa[0] = null；   return o；   }   }   When is the float object created in line 3， eligible for garbage collection？（）  

• A、 Just after line 5.
• B、 Just after line 6.
• C、 Just after line 7.
• D、 Just after line 8（that is， as the method returns）.