Malcolm Is Studying Alone in His Room Late at Night

Multiple Choice

Malcolm is studying alone in his room late at night when he hears a loud noise downstairs.His heartbeat increases significantly and his breathing becomes shallow.He wonders if a burglar has entered the house and decides to investigate.When he gets downstairs he discovers his cat has knocked over a plant stand.His body begins to relax and return to normal.Which part of his nervous system is responsible for returning Malcolm to a normal state?

A) central
B) peripheral
C) sympathetic
D) parasympathetic