Which habit is useful for making a clean edge in a painting?

Correct answer: Applying slow controlled strokes

The governing concept is precision in brushwork. Applying slow, controlled strokes lets the painter guide the brush along the intended edge, maintain even pressure, and correct direction before paint spreads beyond the boundary. Therefore, option B is correct. A very wet brush, dripping paint, or randomly spread bristles makes the edge less predictable and usually produces an untidy result.