What result is most likely when yellow and violet are mixed?

Correct answer: Grey-brown

The governing concept is complementary pigment mixing. Yellow and violet are opposite hues on a traditional colour wheel, so mixing them reduces chromatic intensity rather than creating a brilliant new hue. In ordinary painting, the mixture is likely to appear grey-brown, muddy, or otherwise neutral, making option C correct. Bright orange would require yellow and red, pure green would involve yellow and blue, and pink normally comes from red mixed with white.