SCJP考题一道：垃圾回收时机

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?
A. Line 16
B. Line 17
C. Line 18
D. Line 19
E. The object is NOT a candidate for garbage collection.


请问这道题应该怎么分析啊，循环与ArrayList如何影响Object的引用啊。问都不知道该怎么问啊。
请高手赐教。分不多啦。请多包涵啊。等以后有分了一定慷慨。
有哪位好心网友愿意给几个分的，在下先谢过了。