Which of the following colors is considered an earth tone?

Sienna is considered an earth tone because it is derived from natural pigments found in the earth. Earth tones are characterized by their subdued, muted qualities, often inspired by colors found in soil, rocks, and natural landscapes. Sienna specifically refers to a brown color made from a clay that contains iron oxide, giving it a warm, earthy hue. This color is commonly used in painting and design to create a natural and organic feel.

In contrast, vermilion, aqua, and magenta are vibrant colors that do not fall into the earth tone category. Vermilion is a bright red hue, aqua is a bright blue-green, and magenta is a bold pink-purple color. These colors do not evoke the same natural, muted essence that defines earth tones like sienna.