After an Acute Exacerbation of COPD,the Nurse Prepares an Older

After an acute exacerbation of COPD,the nurse prepares an older adult for discharge to home.Which is the most important patient teaching for the nurse to include for the prevention of hospitalizations for exacerbations of COPD?

A) Ease breathing by sitting upright.
B) Use low-flow oxygen for dyspnea.
C) Avoid sick people and wash hands.
D) Eat nutrient- and calorie-dense foods.