Oxytocin Is a Peptide Hormone That Causes the Smooth Muscle

Oxytocin is a peptide hormone that causes the smooth muscle of the uterus to contract,but it has no effect on the smooth muscle cells of the small intestine.This difference in responsiveness exists because

A) Oxytocin is inactivated prior to reaching the smooth muscle cells of the intestine
B) Intestinal smooth muscle cells do not contain the proper second messenger system
C) Uterine smooth muscle cells contain specific receptors for oxytocin
D) Oxytocin is able to cross the plasma membrane of uterine cells but not intestinal cells
E) Oxytocin is not delivered by the circulatory system to intestinal cells