Which direction is useful for creating a wood-like linear texture with a brush?

Correct answer: Long uneven strokes along the grain direction

The governing concept is texture observation and directional mark-making. Wood has visible grain that generally travels along a lengthwise direction, so long, slightly uneven strokes following that grain create a convincing linear texture. Option A is correct. Random dots, uniform thick bands, or no marks do not describe the directional variation of wood.