问题：

[单选]

11. class Person { 
12. String name = “No name‟； 
13. public Person（String nm） { name = nm； } 
14. } 
15. 
16. class Employee extends Person { 
17. String emplD = “0000”； 
18. public Employee（String id） { empID = id； } 
19. } 
20. 
21. public class EmployeeTest { 
22. public static void main（String[] args） { 
23. Employee e = new Employee（”4321”）； 
24. System.out.println（e.empID）； 
25. } 
26. } 
What is the result？（） 

A .  4321
B .  0000
C .  An exception is thrown at runtime.
D .  Compilation fails because of an error in line 18.