Which mixture is most likely to produce a cleaner green?

Correct answer: Green-biased yellow and green-biased blue

The governing concept is controlling unwanted colour bias during subtractive mixing. For a cleaner green, the yellow and blue should both lean toward green, so they contribute less red, which would neutralise and dull the mixture. Hence option B is correct. Red-biased pigments introduce the unwanted third primary, while orange, violet, grey, or black contamination generally reduces saturation and cleanliness.