What is the correct way to create several variations of orange in a sunset?

Correct answer: Change the ratio of red and yellow

The governing concept is proportional colour mixing. Orange is made by mixing red and yellow, so changing their ratio produces different warm variations: more yellow gives a yellow-orange, while more red gives a red-orange. These variations help represent changing light in a sunset. Therefore, option A is correct. Repeating one orange removes variety, blue shifts the hue away from orange, and equal black mainly dulls every mixture.