What should be done to prevent streaks while painting a flat acrylic colour area?

Correct answer: Using a suitable broad brush with even consistency and controlled strokes in one direction

The governing concept is even application, or flat coverage. A suitable broad brush distributes paint more consistently, while an even mixture and controlled strokes in one direction reduce visible overlaps. Working across a still-wet edge also helps prevent bands and patchy joins. Option B is correct. Repeated dry brushing creates marks, soil contaminates the paint, and washing after every stroke interrupts adhesion and produces an uneven surface.