Under which of the following circumstances are one-way transmissions by an amateur station prohibited?

Answer: B. Broadcasting

Broadcasting, meaning transmissions meant for the general public, is prohibited for amateur stations (FCC rules 97.113 and 97.111). Some one-way transmissions are allowed, such as Morse code practice, telemetry, and announcements for hams.

Tip: Hams talk to hams; broadcasting to the public is not allowed.

FCC rule reference: Part 97.113(b), 97.111(b)