Which is the correct method for making light and dark areas of yellow-orange?

Correct answer: Add white to light areas and a little black to dark areas

In painting, adding white creates a tint, which raises the lightness of yellow-orange for a lighter area. Adding a very small amount of black creates a shade and lowers the value for a darker area. Therefore B describes the correct method. Too much black can dull the colour, while option A reverses tint and shade. Blue would alter the hue rather than simply control light and dark.