A patient with a possible acute coronary syndrome has ongoing chest discomfort unresponsive to 3 SL NTG tablets. There are no contraindications, and 4 mg of morphine sulfate was administered. Shortly afterward, blood pressure falls to 88/60 mm Hg, and the patient has increased chest discomfort. What should you do?

a) Administer more morphine
b) Administer nitroglycerin
c) Administer aspirin
d) Administer an antihypertensive