Which federal agency is responsible for regulating all radio operations?

The Federal Communications Commission (FCC) is the agency tasked with regulating all radio operations in the United States. This includes overseeing the licensing of radio stations, managing the electromagnetic spectrum to prevent interference between different radio transmissions, and ensuring compliance with regulations that govern broadcasting practices. The FCC's responsibilities extend to various forms of communication, including television, wire, satellite, and cable, which highlights its broad role in overseeing communications infrastructure and ensuring that all radio operations function effectively and legally within the assigned frequencies.

In contrast, the other agencies listed have different regulatory focuses: the Federal Trade Commission (FTC) deals primarily with consumer protection and antitrust laws, the Federal Aviation Administration (FAA) oversees civil aviation and air traffic control, and the Occupational Safety and Health Administration (OSHA) focuses on workplace safety and health regulations. Thus, the FCC's specific mandate regarding radio operations distinctly sets it apart as the correct answer.