Why can dominance of diagonal lines create more tension than horizontal lines in a composition?

Diagonal lines break stability and suggest movement and instability

The governing concept is that line direction affects the way the eye experiences balance and movement. Horizontal lines are commonly associated with rest, stability, breadth, and a relatively settled visual position. Diagonal lines, in contrast, depart from that stable horizontal or vertical order. They lead the eye across the composition, suggest action or falling, and can make forms appear to lean or move. When diagonal lines dominate, this repeated directional force can create visual tension and a sense of instability. Option A is correct because it explains both the break in stability and the suggestion of movement. Options B and C are factually false, while D ignores the important relationship between direction and visual meaning. The effect is not automatic in every artwork, but it is a common compositional result when diagonals are prominent.

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