Secondary colours

The governing concept is hue bias in subtractive colour mixing. For the brightest orange, both components should already lean toward orange: an orange-biased red and an orange-biased yellow reduce unwanted blue influence. Therefore option B is correct. Violet-biased red and green-biased yellow contain opposing tendencies and can produce a dull result, while blue-yellow makes green and red-blue makes violet rather than orange.

Expert understanding is demonstrated by applying several connected ideas, not merely recalling vocabulary. A learner should know how secondary colours are formed from component primaries, recognise complementary relationships, and diagnose or correct results by adjusting proportions, value, or intensity. Memorising names or drawing a colour wheel alone shows limited recall. Mixing every colour equally is also incorrect because useful results require purposeful ratios and observation.