Which of the Following Instructions Is Appropriate When Teaching a Dyspneic

Which of the following instructions is appropriate when teaching a dyspneic patient how to breathe effectively?

A) "Take four quick, panting breaths, and then blow out for 6 seconds."
B) "Use deep breathing, and exhale as forcefully as you are able."
C) "Breathe using your abdominal muscles, and blow out slowly through pursed lips."
D) "Hold your breath for 3 seconds after each exhalation to empty all the alveoli."