10. class Line { <br /> 11. public static class Point { } <br /> 12. } <br /> 13. <br /> 14. class Triangle { <br /> 15. // insert code here <br /> 16. } <br /> Which code, inserted at line 15, creates an instance of the Point class defined in Line?() 
A、 Point p = new Point();
B、 Line.Point p = new Line.Point();
C、 The Point class cannot be instatiated at line 15.
D、 Line 1 = new Line() ; 1.Point p = new 1.Point();