Poster colour

The governing concept is subtractive pigment bias. To mix a clean violet, choose a red that leans toward blue and a blue that leans toward red; these pigments introduce less unwanted yellow or green influence into the mixture. Thus B is correct. Yellow-biased red and green-biased blue tend to produce a duller, contaminated violet, while orange–green and yellow–black are not the appropriate primary-pigment pair for a clear violet.

The governing concept is authentic performance assessment: expert skill should be demonstrated through several connected techniques in one finished work. Option B assesses flat coverage, value transitions, lettering, detail control, layering, brush handling, and design integration. The other options test only isolated knowledge or a very narrow procedure, so they cannot provide comprehensive evidence of poster-colour expertise.

The governing review principle is to move from global decisions to local corrections. First confirm the purpose, message, and visual hierarchy; next inspect colour relationships; then examine layer quality, edges, and technical finish; finally remove minor stains or blemishes on a dry surface. Option A follows this logical order. The other choices focus on irrelevant information, begin with minor defects, or omit most quality criteria, so they cannot provide an expert final assessment.