Why is it incorrect to place yellow-orange between red and orange on the colour wheel?

Correct answer: Because yellow-orange is made from yellow and orange

The governing concept is locating a tertiary colour between its two component colours. Yellow-orange is made by combining yellow with orange, so it must be placed between yellow and orange on the colour wheel. The space between red and orange is occupied by red-orange, not yellow-orange. Yellow-orange is not a primary colour, red is present on the wheel, and orange is a secondary colour; therefore option B is correct.