A 28-year-old man with no significant past medical history is rushed to the local trauma center following a stab wound to his chest. Paramedics report that there was significant blood loss. The patient has lost consciousness. He is oliguric and his extremities are cool and moist to touch. His physical exam is also remarkable for tachycardia, tachypnea, a depressed systolic pressure, an immeasurable diastolic blood pressure.

What is the preferred initial pharmacologic agent of choice for this patient?
a. Norepinephrine
b. Dopamine
c. Epinephrine
d. Phenylephrine