If blue and green are present in equal amounts in a mixture which colour is most likely?

Correct answer: Blue-green

On a conventional artist’s colour wheel, blue and green are neighbouring hues. When they are mixed in approximately equal proportions, the result moves toward the intermediate hue between them: blue-green. Thus option B is correct. Yellow-green would require yellow and green, red-violet would involve red and violet, and yellow-orange would involve yellow and orange, so those alternatives do not follow from the stated mixture.