If more yellow than red is used, which colour will be formed?

Correct answer: Yellow-orange

The governing concept is proportional influence during colour mixing. Red and yellow make orange, but adding more yellow shifts the hue toward yellow. The mixture is therefore generally yellow-orange, making option B correct. Red-violet requires red and blue, blue-green requires blue and yellow, and dark red is not the expected hue when yellow is the dominant partner in a red-yellow mixture.