Which is the correct conclusion from an experiment based on primary colours?

Correct answer: Controlled mixing of two primary colours produces secondary colours

The governing concept is evidence-based colour mixing. In a traditional paint experiment, combining two primary colours in controlled proportions produces a secondary colour: red plus yellow gives orange, yellow plus blue gives green, and blue plus red gives violet. Therefore option A is the valid conclusion. The other statements contradict observation: mixtures do not always become black, primary colours are not made only from white, and proportions clearly affect the result.