In an Experiment Investigating Vasoconstriction of the Arterial Wall, Two

In an experiment investigating vasoconstriction of the arterial wall, two samples of isolated porcine arterial vessels are studied.  Vascular tone is measured in the control vessel during infusion of increasing doses of norepinephrine.  The other vessel is pretreated with experimental drug A prior to infusion of norepinephrine.  A graph of the study results is depicted below. Drug A is most similar to which of the following agents?

A) Atropine
B) Labetalol
C) Phenoxybenzamine
D) Phentolamine
E) Propranolol

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