Which red and yellow are most suitable for producing vivid orange?

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

For a vivid orange in pigment mixing, choose a red and a yellow that both lean toward orange. Their colour biases contain less unwanted blue or violet influence, so the mixture remains cleaner and more saturated. Option B is correct. Bluish or violet-biased red introduces a complementary influence that dulls orange, while reddish blue is not the appropriate red primary for this mixture.