Why can very sharp zigzag lines look unsuitable in a calm scene?

They give tension and restlessness opposite to calm mood

Lines have expressive character, not merely geometric direction. Sharp zigzag lines contain sudden changes of angle and rhythm, so they commonly suggest movement, agitation, danger, excitement, or nervous energy. A calm scene usually benefits from gentler curves, stable horizontals, or controlled and widely spaced marks. Therefore option A is correct: the strong visual energy of a sharp zigzag can conflict with the intended peaceful mood. This is a matter of harmony between the line quality and the theme, not an absolute rule that zigzags are always wrong. Option B is an exaggeration, option C assigns them an unrelated fixed function, and option D ignores their distinct angular rhythm. Meaning depends on context, but line character must support the subject.

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