A nurse is teaching about deep-breathing exercises with a client who reports experiencing intense stress at work. Which of the following statements by the client indicates an understanding of the teaching?

Choice A reason: Holding the breath for 5 to 6 seconds may lead to hyperventilation or discomfort, especially in individuals experiencing stress. Deep-breathing exercises emphasize slow, rhythmic breathing—not prolonged breath-holding. Choice B reason: Focusing on the causes of stress during the exercise can increase anxiety and defeat the purpose of relaxation. Mindfulness-based breathing encourages present-moment awareness and physical sensations, not rumination. Choice C reason: Focusing on how the stomach muscles feel with each breath reflects diaphragmatic breathing, which is central to effective deep-breathing techniques. This promotes relaxation by activating the parasympathetic nervous system and reducing physiological arousal. Choice D reason: Inhaling through the mouth and exhaling through the nose is not the recommended technique. Typically, inhaling through the nose and exhaling through the mouth is advised to regulate airflow and promote calmness.