Which acrylic brush is useful for fine details?

Correct answer: Thin pointed brush

A thin pointed brush is best for fine details because its narrow tip produces controlled, precise strokes. It can draw small lines, sharp corners, tiny highlights, and delicate outlines without covering nearby areas. A wide flat brush is better for broad shapes, a fan brush is commonly used for textured effects, and a large round brush holds more paint for larger marks. Thus, option A is correct for detailed acrylic work.