After having a craniectomy and left anterior fossae incision, a patient has a nursing diagnosis of impaired physical mobility related to decreased level of consciousness and weakness. An appropriate nursing intervention is to

a. position the bed flat and log roll the patient.
b. cluster nursing activities to allow longer rest periods.
c. turn and reposition the patient side to side every 2 hours.
d. perform range-of-motion (ROM) exercises every 4 hours.