What is the correct procedure for calling a coast radio station using HF radiotelephone?

Correct Answer: Option C — On a correct ITU channel, give the call sign of the coast radio station three times using the ICAO alphabet, the words "this is", followed by the ship's call sign three times using the ICAO alphabet and ending with "over".

Professional radio etiquette requires using the ICAO phonetic alphabet for all call signs to prevent misinterpretation. The standard protocol for contacting a coast station involves identifying the coast station three times, followed by the vessel's own call sign three times, ensuring the station operator can accurately log the incoming request.