A client is newly diagnosed with type 2 diabetes mellitus. Which diagnostic test will best evaluated the management plan prescribed for this client?

A. Biannual cholesterol testing: Monitoring cholesterol levels is important for cardiovascular risk management, but it does not directly evaluate how well blood glucose levels are controlled. It is a supportive rather than a primary measure of diabetes management. B. A yearly funduscopic examination by an ophthalmologist: Annual eye exams are essential for detecting diabetic retinopathy and other ocular complications. However, they assess the consequences of poor glucose control rather than the ongoing effectiveness of the diabetes management plan itself. C. Quarterly hemoglobin A1C: The hemoglobin A1C test provides an average of blood glucose levels over the previous 2 to 3 months. It is the most reliable measure for evaluating the effectiveness of a diabetes management plan, as it reflects long-term glycemic control and helps guide treatment adjustments. D. Regular foot examinations by a podiatrist: Foot assessments help prevent complications such as ulcers and amputations, which result from neuropathy and poor circulation. Although vital to diabetes care, they do not measure how well the condition is being managed metabolically