Which are the traditional primary colours in painting?

Correct answer: Red, yellow and blue

Traditional painting theory uses the RYB model: red, yellow and blue are treated as the primary colours. Therefore option A is correct. Mixing suitable pairs of these pigments can produce secondary colours; for example, yellow and blue are commonly taught as producing green, while red and yellow produce orange. Green, orange and violet in option B are secondary colours, and the other groups are not the traditional primary set.