A nurse is caring for a client who has pneumonia. Which of the following actions should the nurse take to promote thinning of respiratory secretions?

Choice A reason: Coughing and deep breathing are essential for airway clearance and lung expansion but do not directly thin secretions. They help mobilize secretions once they are loosened. Choice B reason: Increasing fluid intake is the most effective method to thin respiratory secretions. Adequate hydration helps maintain mucociliary clearance and reduces the viscosity of mucus, making it easier to expectorate. Choice C reason: Ambulation promotes lung expansion and circulation, which can indirectly aid in secretion mobilization, but it does not directly affect the consistency of secretions. Choice D reason: Incentive spirometry improves lung expansion and prevents atelectasis but does not directly thin secretions. It is more useful for improving ventilation and preventing complications.