A pedestrian narrowly avoids being hit by an oncoming car. He notices that it takes a little while for hisheart rate and respiratory rate to return to normal. This is likely because

A) the parasympathetic nervous system has become activated.
B) sympathetic activation of the adrenal medulla has released epinephrine and norepinephrine into the bloodstream.
C) the splanchnic nerves have become activated.
D) somatic motor neurons have increased the heart and respiratory rate.
E) the corticospinal pathway has become activated.