Which option correctly matches a colour with its usual temperature effect?

Correct answer: Green — cool

Colour temperature is a perceptual classification rather than a physical temperature. In the usual school-art convention, red and orange are warm, whereas green is commonly treated as cool, especially when it leans toward blue. Blue is also normally cool. Consequently, option D is the correct match; options A, B, and C incorrectly label commonly warm or cool hues.