Final answer:
The most likely diagnosis based on the EKG finding is an inferior wall myocardial infarction (MI).
Step-by-step explanation:
Based on the EKG finding of ST elevation in leads II, III, and aVf, the most likely diagnosis is B) An inferior wall myocardial infarction (MI). An inferior wall MI occurs when there is blockage of one of the coronary arteries supplying blood to the bottom part of the heart. The symptoms of an inferior wall MI can include chest pain that radiates to the jaw and left arm, which aligns with the patient's presentation. It is important to recognize this diagnosis promptly and initiate appropriate interventions.