Physical activity is most likely to lead to successful weight loss if it

The answer is: any individual who provides nursing services to residents in a facility.

Explanation:

A Nursing Assistant is a person who helps disabled or sick people to perform regular tasks, so they won't have any difficulties. They play an integral part in the hospital facility. They must possess long patience and compassion for the person they are assisting.

The question above is asking for the ideal description of a nurse assistant, regardless of the specific state requirements. So, this makes "any individual who provides nursing services to residents in a facility" the correct answer. Since, it did not mention any state requirement, such as license.

A nursing assistant is not a volunteer work, but a profession. This makes the first choice wrong. A person needs to have a high-school diploma and proper training before he/she can work. He can also have a license in order to work in a state.

The second choice is broad because "any individual who is a licensed health professional in a facility" could mean a nurse, a doctor and so on, other than a nursing assistant.

The last choice is definitely wrong. A dietitian is different from a nursing assistant. He is responsible for providing proper nutrition to patients.