Why are different types of lines useful in a picture?

They show different forms, movement, and feelings

The governing concept is line variety: changes in length, thickness, direction, curvature, and continuity create different visual effects. A straight horizontal line may suggest rest or distance, a vertical line may suggest height, and a curved or flowing line may suggest movement and softness. Broken, jagged, or strongly angled lines can communicate energy, tension, or roughness. Option A is correct because varied lines help an artist describe forms and communicate movement and feeling, not merely outline objects. Option B is an absolute and false claim; variety can improve a composition. Options C and D are not normal functions of lines. Consequently, learning several line types gives a picture greater structure, expression, and visual interest.

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