Given:<br /> <img src="https://nimg.ppkao.com/2018-08/wenxueying/2018080116234449110.png?sign=fc82851a35090015aa4f1cdd5e1feaaa&t=62d55418" /><br /> 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