How can dominant and subordinate forms be decided through line?

By giving clearer line weight to the main form and lighter treatment to subordinate forms

The governing concept is visual hierarchy: an artist guides attention by making some elements more prominent than others. Line weight is one effective way to do this. A dominant form may receive darker, thicker, sharper, or more carefully controlled contours, while subordinate forms may use lighter, thinner, broken, or less emphatic lines. The difference helps the viewer identify the primary subject and then notice supporting forms. Option A is correct because it describes a deliberate contrast in line treatment. Identical lines, as in B, reduce emphasis; omitting the boundary, as in C, does not reliably establish dominance; and making the subordinate form heaviest, as in D, reverses the intended hierarchy.

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