What should be done to obtain an even, flat colour in an acrylic painting?

Correct answer: Spread the paint in a consistent direction

The governing concept is uniform paint application. To create an even, flat acrylic colour, apply a sufficient amount of paint with steady pressure and strokes moving consistently in one direction; overlap strokes gently before the layer dries. Option B is correct. Changing colour each time, adding dust, or using a dry brush would create visible variation rather than a smooth, continuous layer.