Which pair is an example of warm and cool neutral colours?

Correct answer: Cream grey and blue grey

Neutral colours can still have a temperature bias. A cream grey contains a subtle yellow or warm influence, so it reads as a warm neutral, while a blue grey contains a cool blue influence and reads as a cool neutral. Thus option A gives the required pair. Red and blue are strongly chromatic colours, yellow and green are not neutral as named, and orange and violet are also coloured hues rather than neutral greys.