An artist wants a gradual transition from yellow to orange. Which colour should be placed between them?

Correct answer: Yellow-orange

On the traditional colour wheel, yellow and orange are adjacent, and yellow-orange is the intermediate tertiary hue created from them. Placing it between the two gives a gradual visual transition instead of an abrupt change. Thus option B is correct. Red-orange lies between red and orange, yellow-green lies between yellow and green, and red-violet belongs to the red-violet region.