Which Is True Concerning Cough and Cough Suppressants

Which is true concerning cough and cough suppressants?

A) Angiotensin-converting enzyme inhibitors (ACE inhibitors) can produce a dry cough.
B) Beta-adrenergic blocker can cause coughing in COPD (Chronic Obstructive Pulmonary Disease) patients.
C) Guaifenesin is more effective if the patient increases water intake.
D) All of the above are true.