Which of the following is an example of a tertiary color?

A tertiary color is created by mixing a primary color with a secondary color, resulting in a hue that is less distinct than pure primary or secondary colors. Plum is a good example of a tertiary color because it is formed by blending the secondary color purple (made by mixing red and blue) with the primary color red, resulting in the rich, muted shade that we recognize as plum.

In contrast, orange and green are considered secondary colors; orange is produced by combining red and yellow, while green results from mixing blue and yellow. Turquoise, on the other hand, is often classified as a shade of blue and is essentially a mix of blue and green but does not fit the strict definition of a tertiary color in this context. Thus, plum stands out as the correct illustration of a tertiary color among the options provided.