What effect can a gradual change in line thickness show?

A change in distance, emphasis, or light

A gradual change in line thickness is an intentional variation of line weight, and it can communicate several visual relationships. A heavier line may bring an edge forward, increase emphasis, or suggest a darker or more strongly lit-and-defined area, while a thinner line may make a boundary appear lighter, farther away, or less important. Smooth variation can therefore contribute to depth, focus, and the perception of light across a form. Option A is correct because it identifies these useful effects without claiming that one fixed meaning applies in every drawing. Option B is unrelated, C is an unnecessarily negative result, and D contradicts the idea of gradual variation. The governing concept is that controlled line weight creates hierarchy and spatial suggestion. Its exact meaning depends on context, but it remains an important expressive resource.

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