A Patient Has Retained Secretions in the Right and Left

A patient has retained secretions in the right and left lower lobe superior bronchi.A nurse is demonstrating to the caregiver how to perform percussion and vibration.Which action by the nurse is appropriate?

A) Positioning the patient in a chair leaning forward on a table
B) Asking the patient to lie flat on the stomach with a pillow under the stomach
C) Assisting the patient to the right side with the arm overhead and the feet elevated
D) Asking the patient to lie on the left side with the head elevated