Final answer:
The primary role of a registered dietitian is to provide nutritional guidance, helping individuals manage and prevent health issues through tailored nutrition plans.
Step-by-step explanation:
The primary role of a registered dietitian is option C) Providing nutritional guidance. Registered dietitians are healthcare professionals who help plan and implement nutrition programs for individuals to treat and prevent various health issues. They utilize their expertise in the fields of nutrition, chemistry, biochemistry, biology, microbiology, and human physiology to design personalized nutrition plans. Dietitians commonly work with patients in healthcare facilities, help manage diseases like diabetes and heart disease, and are indispensable in combating health concerns related to obesity. Additionally, they may find employment in nursing homes, schools, and private practices where their nutritional expertise can have a significant impact on individual and public health.