A 77-year-old patient is admitted to the hospital with a diagnosis of COPD exacerbation. He smokes and was diagnosed with emphysema 10 years ago. He reports a lot of sputum production in the AM, and a chronic cough. His main complaint is being limited with his activities due to shortness of breath. What is the BEST physical therapy intervention for this patient?

A. Smoking cessation education and controlled breathing techniques
B. Secretion clearance techniques and postural drainage
C. Teach him energy conservation techniques
D. Instruction in the use of recovery from shortness of breath positions