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單項選擇題

Given:  
11. static class A {  
12. void process() throws Exception { throw new Exception(); }  
13. }  
14. static class B extends A {  
15. void process() { System.out.println("B "); }  
16. }  
17. public static void main(String[] args) {  
18. A a = new B();  
19. a.process();  
20. }  
What is the result? ()

A. Compilation fails because of an error in line 19.
B. An exception is thrown at runtime.
C. B
D. Compilation fails because of an error in line 18.
E. Compilation fails because of an error in line 15. 
F. The code runs with no output.

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