Several hard colour bands are visible in a calm sky. Which combined correction is most suitable?

Correct answer: Blend the edges with light, overlapping strokes while the paint is damp

The governing concept is a smooth value transition in a wash. When paint remains damp, light overlapping strokes can soften the boundary between adjacent colours before it dries into a hard band. Option D is correct because it combines suitable timing, pressure and movement. Dark outlines exaggerate the bands, dots create unwanted texture, and a dry second coat usually cannot remove the original abrupt edges.