How can emotional effect be created even when the light source is hidden in a painting?

The direction of light and shadow can create mystery or tension

The governing concept is implied lighting. A painting does not need to show a lamp, window, sun, or candle for light to have an emotional effect. Highlights on surfaces, cast shadows, reflected light, contrast, and the direction of illuminated forms allow viewers to infer an unseen source. If the source remains hidden, the uncertainty may create mystery, suspense, isolation, or tension. Therefore, option A is correct. Option B confuses an unseen source with the absence of light. Option C ignores the expressive role of shadow, while option D gives light an unrelated function. The artist can guide mood through the visible consequences of light even when its physical origin is outside the frame.

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