1. public class X {  2. public object m （）  {  3. object o = new float （3.14F）；  4. object [] oa = new object [1]； 5. oa[0]= o；  6. o = null；  7. oa[0] = null；  10. return o；  9. }  10. }  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）.