The nurse is teaching a client with emphysema how to perform pursed-lip breathing. The client asks the nurse to explain the purpose of this breathing technique. Which explanation should the nurse provide?

a) It helps prevent early airway collapse.
b) It increases inspiratory muscle strength.
c) It decreases use of accessory breathing muscles.
d) It prolongs the inspiratory phase of respiration.

Answer: a) It helps prevent early airway collapse.