Which colour pair is most suitable for producing a bright orange?

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

The governing concept is pigment bias, or colour temperature within a subtractive mixing system. A red that leans toward orange and a yellow that also leans toward orange contain less unwanted blue influence, so their mixture generally remains brighter and cleaner. Option B is correct. Bluish red, greenish yellow and violet-biased pigments introduce opposing colour tendencies; green and yellow do not directly produce a bright orange mixture.