What happens if a small amount of yellow is accidentally added to a violet mixture?

Correct answer: Violet becomes neutralised and duller

The governing concept is neutralisation through complementary colour mixing. Yellow and violet are complementary, so adding even a small amount of yellow introduces an opposing hue that reduces violet’s chromatic intensity. The mixture therefore becomes less saturated, more neutral, and usually duller, making option B correct. It does not automatically become green, become more saturated, or always increase in value; the exact value depends on the pigments and proportions.