Which colour is obtained when more blue is added to violet?

Correct answer: Blue-violet

The governing concept is the effect of changing the proportion of a component colour. Violet moves toward blue when more blue is added, producing the tertiary hue blue-violet. Therefore option A is correct, and the dominant colour, blue, is named first. Red-violet would result from adding more red to violet, while yellow-orange and blue-green belong to different neighbouring colour relationships.