What result is obtained if the amount of red is increased in a violet mixture?

Correct answer: Reddish violet

Violet is formed by mixing red and blue pigments. Increasing the red proportion shifts the mixture’s hue toward red, so it is described as reddish violet or red-violet. Consequently, option C is correct. More yellow would move a mixture toward a different warm hue, green requires yellow and blue, and bluish green is unrelated to increasing red in violet.