Which statement correctly describes the relationship between primary and secondary colours?

Correct answer: Two primary colours form one secondary colour

The governing concept is the colour-wheel relationship between primary and secondary colours. In traditional school paint mixing, combining two primary colours produces a secondary colour: red plus yellow gives orange, yellow plus blue gives green, and blue plus red gives violet. Thus, option B states the basic relationship. The other statements either reverse the relationship, introduce an unsupported claim about white, or incorrectly deny the connection.