Why can very heavy decorative shapes weaken the main message in a poster?

They can distract attention from the main text and image

A poster usually has a main purpose: the viewer should quickly notice and understand its message. Decorative shapes can make the design attractive, but they should support the headline, image, or important information. If they are very large, dark, crowded, or visually strong, they may compete with the main content. The viewer’s eye can move toward decoration instead of the intended message, reducing clarity and emphasis. Good poster design therefore uses a clear visual hierarchy and a suitable balance between decoration and communication.

Choice A is correct because heavy decorative shapes can distract attention from the main text and image. The other choices are not logical: decoration does not always improve readability, it does not make a poster empty, and it cannot literally remove colours. The issue is not decoration itself, but decoration that becomes more dominant than the message.

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