Which simple technique is useful for creating tree-bark texture in a painting?

Correct answer: Light strokes with a dry brush carrying little colour

The governing concept is texture creation through controlled brush marks. A dry brush carrying only a small amount of paint skips across parts of the surface and produces broken, irregular strokes. These rough marks can suggest the uneven ridges of tree bark, so option A is correct. A wet wash creates a smooth spread, while a straight band, spilled water, or an uncontrolled mark does not specifically create bark texture.