A nurse manager is reviewing unit records and discovers that patient falls occur most frequently during the hours of 0530 and 0730. Which of the following actions should the nurse take when conducting a root cause analysis?

A. Investigate environmental factors that might be contributing to patient injury during these hours.
B. Review the performance evaluations of nurses who work during these hours.
C. Implement a plan to transition from team nursing to primary care nursing during these hours.
D. Discuss a plan with the HCPs to reduce the use of barbiturate sedatives prior to these hours.