What benefit can changing direction give while making shade with lines?

Surface and volume of the object can become clearer

The governing concept is directional hatching and cross-hatching. Shading lines that follow, cross, or adapt to the contour of a form can describe how a surface turns in space. Changes in direction also allow the artist to vary tone, overlap marks, and suggest different surface qualities. Therefore, option A is correct: the object’s surface and volume can become clearer when the shading direction responds to its form. Option B is wrong because adding or changing hatching normally builds a value range rather than making shade disappear. Option C is not a necessary result; line shading changes value and texture, not the paper itself. Option D has no artistic meaning in this context. Direction alone is not enough: pressure, spacing, density, and the light source must also be considered so that the marks support a believable three-dimensional appearance.

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