Final answer:
Nutritional needs change at the end of puberty around the age of 18.
Step-by-step explanation:
The age at which nutritional needs change at the end of puberty can vary from person to person. Generally, it is around the age of 18, which corresponds to option C. During puberty, there are significant changes in growth and development, and the body's nutritional requirements increase to support these changes. It is important to ensure a balanced diet during this time to meet the body's changing needs.