Which of the following complies with commonly accepted amateur practice when choosing a frequency on which to initiate a call?
Why Band plans are voluntary agreements, coordinated through groups like the ARRL and IARU, that assign segments to particular modes and activities (CW, digital, SSB, beacons, satellites, calling frequencies). Operating within the segment appropriate to your mode is the accepted good amateur practice referenced in 97.101(a), and it keeps incompatible modes from landing on top of each other. Before calling you also listen and ask whether the frequency is in use, but the specific practice being tested here is honoring the band plan.
Watch out Listening for a full two minutes is not any recognized standard; a short listen plus asking "is this frequency in use?" is what operators actually do. Transmitting your call three times is an old phone-calling habit, not a rule, and the FCC only requires identification every 10 minutes and at the end of a communication.
Band plans are voluntary but expected: listen, ask if in use, then call in the right mode segment.