If a river is shown black and the sky red in an artwork what may be the purpose of colours different from reality?

Creating a feeling of crisis, pollution, or unrest

The governing concept is expressive or non-naturalistic colour. Artists do not always use colour only to copy visible reality; they may select black, red, or other unusual hues to create emotional associations. A black river may suggest pollution, death, heaviness, or danger, while a red sky may suggest alarm, violence, heat, or unrest. Together they can create a crisis-like atmosphere, making option A correct. Option B wrongly treats the colours as scientific observation, option C contradicts the visible use of colour, and option D ignores the emotional force produced by the unusual palette. Meaning depends on context, but the question clearly points toward expressive purpose.

This is a Class 9 Art Education question. Chapter: Introduction to Art. Topic: Art as a form of expression.