What defect may occur if the brush moves too quickly in a wash?

Correct answer: Gaps and broken strokes may remain

The governing concept is continuous, adequately loaded brush movement in a wash. Moving too quickly can prevent the diluted colour from reaching and overlapping the whole area, so gaps and broken-looking strokes may remain. Load the brush appropriately and overlap adjacent strokes slightly while maintaining a controlled pace. Paint thickness depends mainly on the paint-water ratio and brush load, not speed alone; the other options are unrelated or absolute claims.