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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.

A.public int compareTo（Object o）{/* more code here */}
B.public int compareTo（Score other）{/* more code here */}
C.public int compare（Score s1， Score s2）{/* more code here */}
D.public int compare（Object o1， Object o2）{/* more code here */}