The correct answer is B) without losing the rhythm of respiration. The reasoning behind this is that during artificial respiration, it is important to maintain a consistent and uninterrupted rhythm of rescue breathing. Switching out rescuers should be done seamlessly, without pausing or disrupting the flow of the respiration. This ensures that the victim receives continuous oxygen support, which is crucial for their survival. The other options are incorrect because A) specifying a time limit is not as important as maintaining the rhythm, C) a set 10-minute interval may not be appropriate in all situations, and D) requiring two additional people is an unnecessary restriction that could delay the rescue effort.