How does line help in understanding form?

It shows the outer boundary, edges and curves of an object

Line is a basic element of art that helps the viewer understand the visible structure of a form. An outline can mark where an object ends and the surrounding space begins. Contour and interior lines can show edges, bends, folds, direction, overlaps, and important surface details. By following these lines, a viewer can understand whether a form is rounded, angular, flat, long, narrow, or uneven, even when colour and shading are limited.

Thus option A is correct: line shows the outer boundary, edges, and curves of an object. The other choices describe senses or properties that line does not directly communicate. A line may help suggest texture or movement, but it does not tell an object’s smell, determine only its colour, or represent its sound. Its main role here is to clarify shape and structure.

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