单项选择题
1. public class Target {
2. private int i = 0；
3. public int addOne（） {
4. return ++i；
5. }
6. }
And：
1. public class Client {
2. public static void main（String[] args） {
3. System.out.println（new Target（）.addOne（））；
4. }
5. }
Which change can you make to Target without affecting Client？（）
A. Line 4 of class Target can be changed to return i++；
B. Line 2 of class Target can be changed to private int i = 1；
C. Line 3 of class Target can be changed to private int addOne（） {
D. Line 2 of class Target can be changed to private Integer i = 0；