If a student writes blue-green for a mixture of yellow and green, what is the correct answer?

Correct answer: Yellow-green

The governing rule is to identify a tertiary colour from the two adjacent colours that are mixed. Yellow combined with green produces yellow-green, so option B is correct. Blue-green is made from blue and green, not yellow and green. Red-orange, blue-violet, and red-violet each require different component pairs, so none of those names matches the mixture stated in the question.