What may happen if a broad brush is pressed too hard in poster colour painting?

Correct answer: Paint may spread unevenly and edges may become distorted

The governing concept is brush control and pressure. Pressing a broad brush too hard makes its bristles spread outward, so the painter loses control over the amount and direction of paint. The poster colour can therefore form an uneven layer and the edges of the shape may become untidy or distorted. Light, even pressure gives a smoother fill. Hard pressure does not automatically increase gloss, whiten paper, or permanently shorten the bristles, so option A is correct.