A Provider Has Prescribed Ipratropium Bromide/albuterol Sulfate (Combivent) for a Patient

A provider has prescribed ipratropium bromide/albuterol sulfate (Combivent) for a patient who has chronic obstructive pulmonary disease (COPD) . The nurse explains that this combination product is prescribed primarily for which reason?

A) To be more convenient for patients who require both medications
B) To improve compliance in patients who may forget to take both drugs
C) To increase forced expiratory volume, an indicator of symptom improvement
D) To minimize the side effects that would occur if the drugs are given separately