A Nurse Notices That Patients Who Ambulate Within the First

A nurse notices that patients who ambulate within the first 12 hours of surgery have fewer postoperative complications. Which approach would provide validation for the nurse's belief that early ambulation reduces postoperative complications?

A) Correlation of postoperative complications with the patients' activity
B) Modification of the patients' activity based on the surgical severity
C) Discussion of postoperative complications with a physical therapist
D) Adjustment of the patients' medications related to their activity levels