What effect can a thick layer of acrylic colour create?

Correct answer: Raised texture

The governing technique is impasto-like application: a thick layer of acrylic paint can dry with visible volume, brush marks, or palette-knife marks, creating a raised texture. Therefore, option A is correct. A transparent wash is normally produced with a thin, diluted layer, while a thick layer is neither automatically flat nor colourless. The actual height depends on the paint quantity and application method, but thickness generally increases surface texture.