If acrylic details repeatedly spread, which correction is suitable?

Correct answer: Use thicker paint with less water and a small brush

The governing concept is control of paint viscosity and brush size. Excess water makes acrylic paint flow beyond the intended edge, while a broad brush is difficult to control for small marks. Working on a wet background can increase spreading. Option D is correct because thicker paint, less water, a small brush, and a dry surface provide better control for fine details.