Which is the best basic exercise for learning colour mixing?

Correct answer: Mix primary colours to make secondary colours

The governing concept is the relationship between primary and secondary colours. In a basic exercise, learners mix pairs of primary colours: yellow with blue produces green, blue with red produces violet, and red with yellow produces orange in common paint practice. Option B is correct because it teaches controlled, observable mixtures. Mixing every colour together can produce a dull result, while black-only painting or using no colour does not practise colour mixing.