Name a key function of the scalp.

The scalp serves several vital functions that are crucial for hair health and overall scalp well-being. One of its key roles is to support hair growth, which occurs in the hair follicles located within the scalp. The scalp also provides protection to the head, acting as a barrier against environmental factors such as UV rays and pollutants. Additionally, the scalp contains sebaceous glands, which produce sebum to keep both the scalp and hair moisturized, further contributing to a healthy hair growth environment.

The other choices do not accurately represent the primary functions of the scalp. Storing hair products is not a biological function of the scalp, and while hair color retention is influenced by various factors, it is not a direct function of the scalp itself. Similarly, the scalp does not act as a tool for styling hair; rather, styling tools are external items used after hair has grown from the scalp. Thus, option B accurately captures the essential role of the scalp in supporting hair growth and providing protection.