How is a sgraffito effect created with acrylic paint?

Correct answer: By scratching the wet upper layer to reveal the layer below

Sgraffito is governed by the principle of subtractive mark-making: an upper layer is scratched, scraped, or incised so that a contrasting colour or ground beneath becomes visible. With acrylic, the timing and condition of the upper layer affect the mark. Option C is correct; spraying water, dipping cloth, or heating varnish does not create the characteristic scratched reveal.