Which organization governs all radio transmissions?

The correct answer identifies the Federal Communications Commission (FCC) as the governing body for all radio transmissions. The FCC is responsible for regulating interstate and international communications by radio, television, wire, satellite, and cable. This includes allocating frequencies, managing interference, and enforcing laws that pertain to telecommunications. The agency's primary goal is to ensure that radio waves are used efficiently and effectively, maintaining order in the radio communications landscape.

In contrast, the National Telecommunications and Information Administration (NTIA) primarily manages the federal government's use of the radio spectrum, but does not govern all radio transmissions across civilian sectors. The Federal Bureau of Investigation (FBI) and the Department of Homeland Security (DHS) focus more on enforcement and security aspects rather than direct regulation of radio communications. While these organizations may have roles that intersect with communication security and law enforcement, they do not oversee the regulatory framework for radio transmissions like the FCC does.