Which method helps show roughness of tree bark?

Drawing irregular, rough lines

Tree bark normally has an uneven surface with cracks, ridges, patches and irregular changes. Drawing broken, varied and rough-looking lines is an effective way to suggest that tactile quality, so option B is correct. The governing concept is that the visual character of a line can represent the texture of a surface: irregular marks communicate roughness more convincingly than perfectly controlled marks. Smooth parallel lines may suggest a neat manufactured surface, a uniform flat colour removes important surface variation, and circular shapes alone do not describe bark structure. A good drawing can vary line length, direction, pressure and spacing to make the bark appear natural without copying every crack. The marks should support the form rather than become unrelated decoration.

This is a Class 9 Art Education question. Chapter: Elements of Art. Topic: Line.