The correct answer is C: Repeat 'CQ' a few times, followed by 'this is,' then your call sign a few times, then pause to listen, repeat as necessary. To indicate you are looking for an HF contact with any station, you should repeat 'CQ' a few times, followed by 'this is,' then your call sign a few times, then pause to listen, repeat as necessary. This is the standard CQ procedure. For amateur radio operators, this is the proper way to call for contacts. Understanding this helps ensure effective calling.