Given： 
What is the result？（）
- A、Compilation fails due to an error in line 23.
- B、Compilation fails due to an error in line 29.
- C、A ClassCastException occurs in line 29.
- D、A ClassCastException occurs in line 31.
- E、The value of all four objects prints in natural order.
正确答案:C
答案解析:有
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