What happens when white is added to a hue?

When white is added to a hue, the primary effect is that the color lightens. This process is known as tinting. By incorporating white into a color, the resulting shade is softer and can appear more pastel. For instance, adding white to red creates pink, illustrating how the inherent qualities of the hue are modified by the addition of white.

While it's important to understand how other color modifications affect a hue, in this case, adding white distinctly alters the brightness and gives the color a lighter appearance, which is the essence of why the choice indicating that the color lightens is the correct answer.