This cardiovascular event may occur when there is a sudden lossof blood flow to the cardiac muscle causeing cardiac muscle cells to stop functioning

I think you may be explaining Myocardial ischemia.

This occurs when the blood going to your is reduced or stopped which prevents oxygen from traveling into your heart. Whenever your heart stops getting blood the mussels begin to deteriorate. This normally happens from coronary arteries aka blockages in your arteries.

I hope this helps. :)

Cardiac Arrest or Sudden Cardiac Death

Answer d would be the best answer, for he wants to have part in biotechnology. an ekg technician is quite similar.