Final answer:
Nurses looking to unionize should contact National Nurses United, the largest nurses' union in the U.S., not to be confused with the American Nurses Association or other entities. So the correct answer is option A.
Step-by-step explanation:
The group of nurses interested in unionizing should contact National Nurses United (NNU), which is the largest union in the United States representing registered nurses. While other organizations like the American Nurses Association (ANA) do exist, they are not primarily a labor union.
National Nurses United has a strong presence across the country, advocating for nurses' rights, better working conditions, and patient safety. The NNU collaborates with the American Federation of Labor and Congress of Industrial Organizations (AFL-CIO), which is noted as the largest federation of unions.
The largest union in the United States representing registered nurses is the National Nurses United (option c). It is a union that aims to protect the rights and interests of registered nurses and improve their working conditions. National Nurses United is known for advocating for safe nurse-to-patient ratios, better compensation and benefits, and improved workplace standards for nurses.