Which temperature contrast is most effective for showing sunlight in a snowy scene?

Correct answer: Blue-violet shadows and yellow-orange light

The governing concept is warm–cool contrast between illumination and shadow. In a snowy scene, yellow-orange light suggests the warmth of sunlight, while blue-violet shadows suggest reflected sky light and cool atmospheric conditions. Option A is therefore most effective. Red shadows and orange light provide little balanced temperature contrast, green light is less natural for ordinary sunlight, and grey light with black shadows gives harsh value contrast without clearly describing sunlight temperature.