Which mixture is better when a vivid violet is required?

Correct answer: Blue-biased red and red-biased blue

The governing concept is pigment bias in subtractive colour mixing. A vivid violet is obtained from a red that leans toward blue or magenta and a blue that leans toward red or violet. These choices contain less yellow or green contamination, so the mixture stays cleaner and more saturated. Option B is correct. Yellow-biased red and green-biased blue introduce opposing influences, while red-green and blue-orange are complementary-type pairs that tend to neutralise rather than produce vivid violet.