In hair coloring, level describes the color's lightness or darkness.

• A. Hue
• B. Level
• C. Tone
• D. Saturation

Answer: (B)

Level describes how light or dark the hair color will be. That’s why it’s the best answer: it directly indicates brightness, independent of the color family or undertones. Hue refers to the actual color family (red, brown, yellow, etc.), not how light or dark it is. Tone describes warmth or coolness within a color at a given level—its undertone—without changing the brightness. Saturation is about how vivid or muted the color appears, which again doesn't tell you how light or dark the shade is. In practice, you pick a level to hit the desired brightness first, then adjust the tone for warmth or coolness and the hue to shift the color family, with saturation controlling vividness. For example, a higher level like 7 is lighter than a lower level like 5, while the tone could make either shade warm or cool, and the saturation would affect how vibrant it looks.