Which mixture is more likely to produce a vivid violet?

Correct answer: A red-biased blue and a blue-biased red

The governing concept is pigment bias in subtractive colour mixing. A red-biased blue and a blue-biased red contain fewer traces of yellow or green, so they absorb less unwanted light when combined and produce a cleaner, more saturated violet. Option B introduces opposing yellow-green influences, while red-green and blue-orange are complementary pairings that generally neutralise toward brown or grey rather than producing vivid violet.