A student says that green is always a secondary colour. What is the best evaluation of this statement?

Correct answer: It is correct only in the traditional red-yellow-blue pigment system

The governing concept is that colour classification depends on the medium and mixing model. In the traditional red-yellow-blue pigment system, green is made by mixing yellow and blue, so it is secondary there. In additive light, however, green is one of the primary lights. Therefore option B is the best evaluation; the words “always” and “no system” make options A and D incorrect.