If more red than blue is used, which colour will be formed?

Correct answer: Red-violet

The governing concept is the effect of a dominant hue in a mixture. Red and blue produce a violet family colour; when red is used in greater quantity, the mixture shifts toward red and is described as red-violet. Therefore option A is correct. Blue-green needs blue and yellow, yellow-orange needs yellow and red, and light green needs a mixture involving yellow and blue rather than red and blue.