Which option correctly relates form contour and internal shading?

Contour gives the boundary, while internal shading shows volume

The governing concept is that contour and internal shading perform different but complementary jobs in describing form. The contour or outer boundary identifies the silhouette and separates the object from the surrounding space. Internal shading describes the turning of surfaces, changes in plane, light-to-dark movement, and therefore the object’s volume and depth. Option A states this relationship correctly. Option B is incomplete and false because an outline alone can show the outside shape but cannot reliably explain rounded volume or surface direction. Option C ignores one of the main methods used to suggest three-dimensional structure in a drawing. Option D is unrelated because contour is a visual boundary, not a sensory quality such as smell. A convincing study often begins with the contour and then adds shading that follows a consistent light source.

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