Which type of shadow will increase depth in a warm afternoon scene?

Correct answer: Muted blue-violet shadow

The governing concept is temperature contrast between illumination and shadow. Warm afternoon light is strengthened when the shadow shifts toward a muted cool blue-violet, creating separation and helping forms turn in space. Therefore option D is correct. Yellow, orange, and red shadows remain warm and are closer to the light temperature, so they provide less atmospheric contrast and usually create weaker depth in this specific scene.