For what can an artist use the thickness, direction, and movement of line?

To show energy, tension, or calmness

The governing concept is line quality as an element of visual expression. A line is not defined only by its position; its thickness, direction, speed, pressure, and continuity also affect the viewer’s response. Thick or sharply angled lines may communicate force, movement, or tension, while thin, gentle, horizontal, or slowly flowing lines may suggest calmness and stability. Lines can help construct forms and proportions, but that is not the expressive purpose asked about here. They cannot permanently increase colour brightness or physically smooth paper. Option A is correct because changes in line quality communicate mood and energy, allowing an artist to make an image feel active, restless, peaceful, or controlled.

This is a Class 9 Art Education question. Chapter: Introduction to Art. Topic: Art as a form of expression.