Why are lines used in hatching?

To show shade or tone

The governing concept is hatching, a drawing method that builds value with repeated lines. When lines are placed close together, the area appears darker; when they are spaced farther apart or drawn more lightly, it appears lighter. This controlled change in line density, pressure, direction, and spacing allows an artist to suggest shade, tone, volume, and sometimes surface texture without filling the area with solid colour. Therefore, option A is correct. Tearing the picture damages the paper rather than creating a controlled value, and adding paper weight or making sound is unrelated to the visual purpose of hatching. Cross-hatching may add another direction of lines, but basic hatching itself can already show tonal variation through one main direction.

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