Which of the Following Best Describes the Primary Conclusion of the Report

Which of the following best describes the primary conclusion of the report To Err Is Human: Building a Safer Health System?

A) Hospital staffing must be improved to focus on safety rather than cost containment.
B) Quality of care and medical error are not easily defined.
C) Patients must recognize that care providers are human and errors will occasionally be made.
D) System failures are resulting in an incredible amount of harm from medical errors.