Final answer:
The scope of practice in a profession like registered dietitians typically describes their range of roles, activities, and regulations.
Step-by-step explanation:
The definition of a 'scope of practice' in the context of professions is option B: The scope of practice typically describes the practitioners range of roles, activities, and regulations within which nutrition and dietetics practitioners perform.
For registered dietitians, their scope of practice involves planning nutrition programs for individuals in various settings, such as health care facilities, nursing homes, schools, and private practices. They design nutrition plans to prevent and treat diseases, and their role often includes teaching patients how to manage their health through proper nutrition.