Which mixture can create a muted yellow-orange?

Correct answer: Add a very small amount of blue-violet to yellow-orange

The governing concept is complementary contrast and controlled desaturation. Blue-violet is opposite yellow-orange on the colour wheel, so a very small amount can reduce the mixture’s brightness and intensity, creating a muted version. Thus option B is correct. White mainly makes the colour lighter or less saturated without providing the intended complementary neutralisation, while extra yellow or red strengthens the warm colour instead of muting it. The complement must be added sparingly.