If both yellow-green and blue-green are required which basic mixture remains the same?

Correct answer: Yellow and blue

The governing concept is secondary-colour formation through primary-colour mixing. Green is made by combining yellow and blue. Yellow-green contains a larger yellow proportion, while blue-green contains a larger blue proportion, but the basic pair remains yellow plus blue. Therefore option B is correct. Red and yellow form orange, red and blue form violet, and green plus violet is not the basic mixture used to make these two green variations.