You Are Walking Down the Street When a Strange Dog

Multiple Choice

You are walking down the street when a strange dog begins to chase you. You manage to duck into a store and notice in a nearby hanging mirror that your pupils are very dilated. Which of the following most likely accounts for this?

A) The parasympathetic nervous system was stimulated by the scare and it, in turn, stimulated the circular smooth muscles of the iris to contract.
B) The parasympathetic nervous system was stimulated by the scare and it, in turn, stimulated the radial smooth muscles of the iris to contract.
C) The sympathetic nervous system was stimulated by the scare and it, in turn, stimulated the radial smooth muscles of the iris to contract.
D) The sympathetic nervous system was stimulated by the scare and it, in turn, stimulated the circular smooth muscles of the iris to contract.