10. class Nav{ 11. public enum Direction { NORTH， SOUTH， EAST， WEST } 12. } 13. public class Sprite{ 14. // insert code here 15. } Which code， inserted at line 14， allows the Sprite class to compile？（）

A. Direction d = NORTH；
B. Nav.Direction d = NORTH；
C. Direction d = Direction.NORTH；
D. Nav.Direction d = Nav.Direction.NORTH；