What may happen if yellow enters a violet mixture?

Correct answer: Violet may become muddy or greyish-brown

Violet is made by combining red and blue. Adding yellow introduces the third basic component and creates a mixture with reduced saturation; because yellow contrasts with violet, the result may look muddy, greyish, or brownish rather than brighter. It does not change directly into green, and mixing cannot make violet a primary colour. Therefore option B is correct. The governing concept is that unintended addition of a contrasting colour usually lowers the purity and intensity of a paint mixture.