10. class Nav{ <br /> 11. public enum Direction { NORTH, SOUTH, EAST, WEST } <br /> 12. } <br /> 13. public class Sprite{ <br /> 14. // insert code here <br /> 15. } <br /> 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;