What inserted at line 39, will sort the keys in the props HashMap?()<br /> <img src="https://nimg.ppkao.com/2018-08/zhoulian/2018080116103241280.jpg?sign=6c2778f8b44a48e179c1f7579b860480&t=62d1aa58" />
A、Arrays.sort(s);
B、s = new TreeSet(s);
C、Collections.sort(s);
D、s = new SortedSet(s);