Given：  
11. public void genNumbers（） {  
12. ArrayList numbers = new ArrayList（）；  
13. for （int i=0； i<10； i++） {
14. int value = i * （（int） Math.random（））；  
15. Integer intObj = new Integer（value）；  
16. numbers.add（intObj）；  
17. }  
18. System.out.println（numbers）；  
19. }  
Which line of code marks the earliest point that an object referenced by intObj becomes a  candidate for garbage collection？（）