Final answer:
The best course of action would be to explain the concerns about the woman's vitals and the potential risks she may face and ask her to call if she needs medical attention, respecting her decision and leaving as she desired.
Step-by-step explanation:
In this scenario, the woman is experiencing difficulty breathing and has low blood pressure, a slow pulse, and normal respirations. Considering her age, pacemaker, and high blood pressure medication, her vitals may be a sign of distress. Option A, transporting her to the ER, seems appropriate. However, it is crucial to respect the patient's wishes and autonomy. Therefore, the best course of action would be to explain the concerns about her vitals and the potential risks she may face and ask her to call if she needs medical attention, respecting her decision and leaving as she desired (Option C).