The correct answer is B: Broadcasting. According to FCC Part 97.113(b), broadcasting (one-way transmissions intended for reception by the general public) is prohibited in the Amateur Radio Service. Amateur radio is a two-way communication service, not a broadcast service. Broadcasting is defined as transmissions intended for reception by the general public, rather than specific amateur stations. Amateur radio is designed for point-to-point or point-to-multipoint communications between licensed amateur operators, not for general broadcasting to the public. However, other one-way transmissions are permitted in specific circumstances, such as beacons (for propagation study), telecommand (for controlling remote stations), telemetry (for data transmission), and certain other authorized one-way operations.