A patient diagnosed with chronic obstructive pulmonary disease (COPD) asks the nurse why clubbing occurs. Which response by the nurse is the most therapeutic?

"Your disease often makes patients lose mental status."

"Your disease will be helped if you pursed-lip breathe."

"Your disease affects both your lungs and your heart, and not enough blood is being pumped."

"Your disease doesn't send enough oxygen to your fingertips."