Which color palette utilizes various intensities of a single color?

The correct answer is monochromatic. This color palette is characterized by the use of one base color combined with its various shades, tints, and tones. In a monochromatic scheme, you might take a single hue and adjust its intensity or brightness by adding white, black, or gray. This results in a cohesive and harmonious look, as all colors are derived from the same hue, allowing for smooth transitions and a sense of unity in the design.

Other color palettes, while they may also be visually appealing and effective, do not focus on variations of a single color. For example, complementary palettes involve colors that are opposite each other on the color wheel, creating contrast. Analogous palettes consist of colors that are next to each other, providing a more subdued and harmonious look but still involve multiple hues. Split-complementary palettes include one base color and two adjacent colors to its complementary color, ensuring a vibrant contrast but again utilizing more than one hue.