Final answer:
The correct intervention for a patient reporting angina is to provide oxygen and contact emergency services, as well as possibly administering pain relief medication like nitroglycerin.
Step-by-step explanation:
The appropriate intervention for a patient complaining of chest pain/angina includes administering oxygen and contacting emergency services (Option D). Immediate treatments for myocardial infarction (MI) are critical and may include this approach. Providing pain relief medication, such as nitroglycerin, which is administered sublingually to facilitate its absorption is also common. Nitroglycerin acts as a vasodilator due to the release of nitric oxide. Furthermore, aspirin may be given to assist in breaking up blood clots. Long-term treatments may encompass a range of interventions including anticoagulants, coronary interventions, and in severe cases, coronary replacement.