Which of the following is a recognized national standards organization?

The National Fire Protection Association (NFPA) is a recognized national standards organization known for developing codes and standards to help ensure fire safety. The NFPA produces documents that provide guidelines for fire prevention, electrical safety, and fire alarm systems, among other areas. Its standards are widely adopted and often serve as the basis for local and state regulations, making it a cornerstone of fire safety awareness and engineering in the United States.

In contrast, the other organizations listed are either not as widely recognized or do not have the same level of authority or established standards in fire safety. The NFPA's contributions to fire safety legislation and its role in educating the public about fire risks further solidify its status as a leading organization in this field.