Which of the following colors is a tertiary color?

A tertiary color is created by mixing a primary color with a secondary color. The primary colors are red, blue, and yellow, while the secondary colors are orange, green, and purple.

Light brown, typically described as a shade or tint rather than a color in the traditional sense, is not classified as a tertiary color. Instead, it can be produced by mixing colors like orange and purple or yellow and purple, depending on the desired shade. Therefore, the primary and secondary colors do not lead to light brown fitting into the categorized definition of a tertiary color.

In the case of the other choices, orange, purple, and green are considered secondary colors because they result from the mixing of primary colors. For example, orange (red and yellow), green (blue and yellow), and purple (red and blue) fit neatly into the primary-secondary color framework.