Which of the following is a color scheme that incorporates four colors?

The correct answer is a color scheme that incorporates tetrads, which consist of four colors. Tetradic color schemes utilize two complementary color pairs, creating a rich and dynamic palette. This approach allows for a wide range of color combinations, fostering both harmony and contrast when designing. The inclusion of analogous colors with this scheme can further enhance visual interest by providing smooth transitions between some of the colors used.

In contrast, the other options do not collectively represent a four-color scheme. For example, split-complementary involves one base color and two adjacent to its complementary color, resulting in three colors. Monochrome refers to variations in lightness and saturation of a single hue, showcasing one color rather than four. Triadic schemes typically involve three colors that are equidistant from each other on the color wheel.

Understanding these nuances helps grasp how different color combinations are utilized effectively in design, which is crucial for creating compelling visual content.