Which pigment pair is more suitable for producing a clean orange?

Correct answer: Yellow-biased red and red-biased yellow

The governing concept is compatible pigment bias. Orange is made from red and yellow, so a red leaning toward yellow and a yellow leaning toward red reinforce the neighbouring orange region of the colour wheel. This limits opposing blue or green contamination and produces a cleaner result. Option B is correct; the other pairs contain unsuitable biases or do not provide the required red-yellow combination.