Crystal Is Playing 'Bear on the Loose',a Scary Version of Hide

Multiple Choice

Crystal is playing 'bear on the loose',a scary version of hide and seek that is played in the dark.Crystal is supposed to be looking for her friend the 'bear',but she is too afraid to venture more than 20 feet from the safety of home base.Suddenly,she hears a twig break right behind her,followed by a big roar.Crystal screams in fear,but as soon as she realizes that this was just her friend,her ___ would help her to calm down.

A) sympathetic nervous system
B) parasympathetic nervous system
C) somatic nervous system
D) central nervous system