When might a hair mask be chosen for a client?

A hair mask is often chosen for a client when a moisturizing and/or protein treatment is desired due to its ability to deeply nourish and repair the hair. Hair masks are formulated with concentrated ingredients that target specific hair concerns, such as dryness, damage, or lack of elasticity. They can restore moisture levels, improve hair strength, and enhance overall texture. This makes them particularly beneficial for clients who have porous, brittle, or chemically treated hair, as they help to rejuvenate and provide long-lasting hydration and protection.

In contrast, other options do not align with the primary functions of a hair mask. For instance, a color treatment focuses on changing the hair color, while styling refers to how the hair is arranged or finished. Scalp exfoliation is a treatment aimed at cleaning the scalp, which is distinct from the hydration and repair benefits a hair mask offers. Thus, hair masks serve a specific purpose of enhancing hair condition through moisture and protein, solidifying option B as the appropriate choice.