A Patient's Neurological Status Deteriorates Over Hours, and a Craniotomy

A patient's neurological status deteriorates over hours, and a craniotomy is performed to evacuate the hematoma. Which nursing intervention is indicated to help decrease the threat of increased intracranial pressure?

A) Elevate the head of the bed 30 degrees.
B) Cluster nursing interventions to provide uninterrupted periods of rest.
C) Teach him to cough and deep breathe to prevent the necessity for suctioning.
D) Teach him to hold his breath and bear down while repositioning in bed.