Which colour arrangement would make a cool shadow look natural within a warm environment?

Correct answer: Blue-violet shadow opposite warm yellow light

Perceived shadow colour depends on the colour of the illumination and the surrounding field, not only on the object’s local colour. Under warm yellow light, an unlit or less illuminated area may be represented with a cool blue-violet tendency, creating a convincing temperature contrast. Option A is correct. The other pairs repeat warm or local hues and do not explain a naturally cool shadow in a warm setting.