Which colour lies exactly between red and orange on a twelve-part colour wheel?

Correct answer: Red-orange

On a traditional twelve-part colour wheel, primary and secondary colours alternate, and a tertiary colour sits between each adjacent pair. Red and orange are neighbours, so the intermediate tertiary colour is red-orange. Option A is correct; yellow-orange lies between yellow and orange, red-violet between red and violet, and blue-green between blue and green.