What can be added if orange appears too red and needs balancing?

Correct answer: A little yellow

Orange is produced mainly from red and yellow. If the mixture looks too red, the governing correction principle is to add a small amount of the component colour that is relatively lacking. Adding a little yellow shifts the hue toward a more balanced orange, so option C is correct. Blue, violet, or black would darken, neutralise, or muddy the mixture and would not correct a red-dominant orange as directly. Add the correction gradually.