Which mixture is correct for making yellow-orange?

Correct answer: More yellow and less red

The governing concept is the creation of an intermediate or tertiary hue by varying the proportions of neighbouring colours. Yellow-orange contains yellow and red, but it must lean toward yellow, so the mixture uses more yellow and less red. Option B is correct. More red would create red-orange; blue-based mixtures would move toward green or violet rather than yellow-orange.