If a painting uses only red, yellow, and blue, what is it based on?

Correct answer: Primary colour scheme

The governing concept is the traditional pigment colour system. Red, yellow, and blue are taught as the three primary colours because they serve as the starting set for producing many other colours through mixing. A work restricted to these three colours is therefore based on a primary-colour scheme, making option D correct. A secondary scheme would use colours such as green, orange, and violet; monochromatic means one hue, and neutral means colours such as grey, black, or white.