Which of the following colors is a secondary color?

The choice of green as a secondary color is correct because secondary colors are created by mixing two primary colors. In traditional color theory, the primary colors are red, blue, and yellow. When you mix blue and yellow, you achieve green, which is classified as a secondary color.

Understanding primary and secondary colors is fundamental in color mixing and art. The other choices, red, blue, and yellow, are all primary colors, which are the building blocks for creating other colors. This distinction is crucial in various artistic applications, including painting, design, and color theory.