Fred Was Admitted to the Cardiac Unit with Chest Pains

Fred was admitted to the cardiac unit with chest pains. No arrhythmias and no large changes in the heart rate were observable. Blood samples taken over the next few days showed no increase in enzymes, such as creatine phosphokinase. A possible treatment of the condition is

A) beta adrenergic blocking agents.
B) nitroglycerin.
C) calcium channel blocking agents.
D) aspirin.
E) exercise.