Brush marks are visible in a smooth sky blend. Which correction is most suitable?

Correct answer: Use a suitable soft, wide brush with a sufficiently fluid paint mixture

The governing concept is brush technique matched to paint consistency. A soft, broad brush distributes a wash over a large sky area, and sufficiently fluid paint allows neighbouring strokes to overlap and merge before they dry. This reduces visible bristle tracks, so option A is correct. A hard small brush exaggerates marks; scrubbing a dry layer can damage the surface; constantly changing direction produces uneven texture rather than a calm blend.