When will complex shapes in a decorative border be considered successful?

When they create rhythm and support the main design

A decorative border is successful when its forms enrich the edge of a composition without competing destructively with the central design. Repeated or carefully varied complex shapes can create rhythm, guide the eye, define the boundary, and support the theme. Option A is correct because it combines visual rhythm with a supportive relationship to the main design. Complexity alone is not the goal: if the border attracts all attention, option B, it weakens hierarchy. If shapes break their relationship, option C, the border loses unity. Random forms without a pattern, option D, usually create confusion rather than purposeful decoration. Variation may be used, but it should remain controlled by repetition, spacing, scale, and the overall composition.

This is a Class 9 Art Education question. Chapter: Design and Composition. Topic: Border design.