What should be done to make colour filling believable in a misty atmosphere?

Correct answer: Reduce colour contrast and soften edges

The governing concept is atmospheric perspective. Mist scatters light and reduces the apparent contrast, saturation, and sharpness of distant objects. Therefore, believable colour filling uses slightly subdued colours and softer edges, especially in the background. Dark black outlines and highly saturated colours would make objects appear unnaturally close and crisp, while equal intensity in foreground and background would remove the sense of depth. Thus, option A best represents the required technique.