The nurse is teaching an in-service program to a group of nurses on the topic of gastrointestinal disorders. the nurses in the group make the following statements. which statement is most accurate related to the diagnosis of congenital aganglionic megacolon? a) in this disorder the sphincter that leads into the stomach is relaxed. b) there are recurrent paroxysmal bouts of abdominal pain. c) a partial or complete intestinal obstruction occurs. d) a thickened, elongated muscle causes an obstruction at the end of the stomach.