问题：

[单选]

1. class A { 
2. public int getNumber（int a） { 
3.     return a + 1； 
4. } 
5. } 
6.   
7. class B extends A { 
8. public int getNumber （int a） { 
9. return a + 2 
10. } 
11.   
12. public static void main （String args[]）  { 
13. A a = new B（）； 
14. System.out.printIn（a.getNumber（0））； 
15.    }
16. }    
What is the result？（）  

A .  Compilation succeeds and 1 is printed.
B .  Compilation succeeds and 2 is printed.
C .  An error at line 8 causes compilation to fail.
D .  An error at line 13 causes compilation to fail.
E .  An error at line 14 causes compilation to fail.