Considering the patient's current medication regimen and medical conditions, which of the following clinical considerations is most important to address in this patient?
Monitoring INR levels due to Warfarin therapy and risk of bleeding, especially given the patient's miscarriage history. Switching Verapamil to an alternative calcium channel blocker due to the patient's prediabetes. Increasing the dose of Vitamin B12 due to the patient's stress and risk activity involvement. Starting insulin therapy due to the patient's prediabetes and BMI of 30.8 kg/m2.