Constriction of small arteries and reduction in the flow of blood to visceral organs are functions of ________.

A) postganglionic fibers of the collateral ganglia
B) preganglionic fibers innervating the suprarenal medullae
C) sympathetic postganglionic fibers in the spinal nerves
D) postganglionic fibers innervating the suprarenal medullae
E) postganglionic parasympathetic fibers