If equal amounts of red and yellow make orange what happens when the amount of red is increased?

Correct answer: Red-orange

The governing concept is the effect of changing mixing proportions. Equal red and yellow produce orange, but increasing the red component shifts the resulting hue toward red while it remains in the orange family. Therefore the mixture becomes red-orange, so A is correct. Yellow-green requires yellow and green, blue-violet uses blue and violet, and adding red does not produce light yellow.