How many primary colours are generally mixed to make a secondary colour?

Correct answer: Two

The governing concept is the definition of a secondary colour in the traditional art colour system: it is produced by mixing two primary colours. Therefore option B is correct. For example, red plus yellow makes orange, yellow plus blue makes green, and blue plus red makes violet. One primary colour remains primary, while mixing all three is not the standard process for producing one pure secondary colour and may create a dull mixed result.