Which of the following applies when two stations transmitting on the same frequency interfere with each other?
Why No amateur station or group owns a frequency; FCC rules give no one priority based on being there first (except during emergencies). When two stations find themselves interfering, the expected practice is common courtesy: talk it over and work out who continues, who moves, or how to share. Good amateur practice, which the FCC expects under Part 97, is cooperation rather than claiming rights.
Watch out The choice about the first station having preemptive rights is tempting because it sounds like a traditional priority rule, but frequencies are shared and no station can claim ownership. Requiring both stations to leave is also not the rule, and subaudible tones only control receiver squelch, they do not stop the signals from colliding on the air.
Nobody owns a frequency. When you clash, negotiate, don't claim squatter's rights.