An Unconscious Patient Has a Nursing Diagnosis of Ineffective Tissue

An unconscious patient has a nursing diagnosis of ineffective tissue perfusion (cerebral) related to cerebral tissue swelling. An appropriate nursing intervention for this problem is to

A) maintain the patient in a head-up position.
B) position the patient with the knees and hips flexed.
C) cluster nursing interventions to provide uninterrupted periods of rest.
D) encourage coughing and deep-breathing to improve oxygenation.