The correct answer is A: The stations should negotiate continued use of the frequency. When two stations transmitting on the same frequency interfere with each other, the proper procedure is for the stations to negotiate and work out an agreement about continued use of the frequency. This is part of good amateur radio operating practice. Negotiation might involve one station moving to another frequency, sharing the frequency by taking turns, or finding another solution that works for both. The key is cooperation and communication, not conflict. Amateur radio operators are expected to work together to resolve frequency conflicts amicably. This reflects the cooperative spirit of the amateur radio service.