Which of the following is a core category of services offered in the beauty industry?

Skin care is a core category of services offered in the beauty industry, as it encompasses a wide range of treatments and products focused on improving and maintaining the health and appearance of the skin. This category includes services like facials, chemical peels, and various skincare consultations, all aimed at addressing different skin concerns such as aging, acne, and hydration.

In contrast, the other options are not associated with the beauty industry. Housekeeping services focus on cleaning and maintaining homes, catering services are related to food preparation and event management, and automobile detailing involves the cleaning and restoration of vehicles. These areas do not pertain to beauty or personal care, highlighting that skin care distinctly represents a primary service area within the beauty sector.