Which mixture is more suitable for obtaining the brightest orange?

Correct answer: Orange-biased red and orange-biased yellow

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.