【单选题】
1. public interface A { <br /> 2. public void doSomething（String thing）； <br /> 3. } <br /> 1. public class AImpl implements A { <br /> 2. public void doSomething（String msg） { } <br /> 3. } <br /> 1. public class B { <br /> 2. public A doit（） { <br /> 3. // more code here <br /> 4. } <br /> 5. <br /> 6. public String execute（） {<br /> 7. // more code here <br /> 8. } <br /> 9. } <br /> 1. public class C extends B { <br /> 2. public AImpl doit（） {<br />  3. // more code here <br /> 4. } <br /> 5. <br /> 6. public Object execute（） { <br /> 7. // more code&ens
A、 Compilation will succeed for all classes and interfaces.
B、 Compilation of class C will fail because of an error in line 2.
C、 Compilation of class C will fail because of an error in line 6.
D、 Compilation of class AImpl will fail because of an error in line 2.
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