Directing lines toward the main subject in a composition strengthens which principle?

Focusing the viewer's attention

Directional or leading lines guide the viewer’s eyes through a composition and often end at, point toward, or surround the main subject. This is an application of line as a compositional tool: direction controls visual movement and helps establish emphasis or a focal point. Option B is therefore correct because lines aimed toward the subject make that area more noticeable and organize the order in which the image is viewed. Colour mixing concerns the combination of pigments, paper texture concerns the surface quality, and frame decoration concerns the border rather than the internal visual path. Leading lines may be roads, branches, arms, architectural edges, or repeated marks, but their common function is to direct attention.

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