Final answer:
To address the issue of the patient's persistently high A1C level of 9% in type 2 diabetes (DMT2) despite being on metformin, the most appropriate option would be to start a basal and bolus insulin regimen.
Step-by-step explanation:
To address the issue of the patient's persistently high A1C level of 9% in type 2 diabetes (DMT2) despite being on metformin, the most appropriate option would be to start a basal and bolus insulin regimen. This involves adding both a long-acting basal insulin to provide background insulin throughout the day and a rapid-acting bolus insulin to cover mealtime spikes in blood sugar.