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单项选择题

34. HashMap props = new HashMap(); 
35. props.put(”key45”, “some value”); 
36. props.put(”key12”, “some other value”); 
37. props.put(”key39”, “yet another value”); 
38. Set s = props.keySet(); 
39. // insert code here 
What, inserted at line 39, will sort the keys in the props HashMap?() 

A. Arrays.sort(s);
B. s = new TreeSet(s);
C. Collections.sort(s);
D. s = new SortedSet(s);

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