Who among the listed travelers is permitted to be armed on board?

The correct answer is C, as Federal Air Marshals and Law Enforcement Officers are explicitly authorized to carry firearms on board aircraft as part of their duties in maintaining security and safety in the aviation environment. These individuals undergo extensive training and are required to adhere to specific regulations related to the transport of firearms.

Flight attendants are not permitted to carry firearms as part of their standard duties, while passengers with special permits are generally not allowed to bring firearms on flights due to strict regulations governing the transport of weapons. Crew members, such as pilots and flight attendants, do not have the same privileges regarding the carrying of firearms as Federal Air Marshals and Law Enforcement Officers. This distinction is vital for ensuring passenger safety and maintaining a secure environment on board aircraft.