Drug affinity at the vascular alpha-1 receptor:
Most --> least

a) Norepinephrine > Epinephrine > Phenylephrine > Dopamine
b) Phenylephrine > Norepinephrine > Dopamine > Epinephrine
c) Epinephrine > Norepinephrine > Dopamine > Phenylephrine
d) Dopamine > Norepinephrine > Phenylephrine > Epinephrine