What is the best use of dry brush to show both light and shade on tree bark?

Correct answer: Apply broken directional strokes of different tones

Dry-brush technique uses relatively little paint or moisture, allowing broken marks to catch the irregular texture of the surface. Using different light and dark tones with directional strokes follows the bark grain and suggests raised and recessed areas. Option A is correct. An even wet surface removes the dry-brush character, while one black band or erased marks cannot describe varied texture and illumination.