In the traditional pigment system, mixing red and yellow moves toward which colour?

Correct answer: Orange

The governing concept is traditional subtractive pigment mixing, commonly represented by the RYB colour wheel. Red and yellow are neighbouring primary pigments in that model, and their combination produces orange, a secondary colour between them. Violet requires red plus blue, and green requires yellow plus blue; cyan is not the usual RYB result. Therefore option C is correct, although the exact hue changes with the mixing ratio.