Final answer:
The best option for the EMT is to immediately administer the patient's EpiPen.
Step-by-step explanation:
The best option for the EMT in this situation is to immediately administer the patient's EpiPen. Anaphylaxis is a severe allergic reaction that can be life-threatening, causing respiratory distress and a drop in blood pressure. Epinephrine, which is found in the EpiPen, counteracts the effects of anaphylaxis by raising blood pressure and relaxing bronchial smooth muscle.