Which brush is more useful for making small details?

Correct answer: Thin pointed brush

The governing brush-technique principle is that fine work requires a tool with a narrow tip and controlled paint flow. A thin pointed brush can make small lines, edges, dots, and other precise details, so option D is correct. A broad brush covers large areas, while a sponge and cloth produce soft or irregular marks rather than sharp, controlled details. Brush size should always match the intended mark.