When preparing a client for a scheduled colonoscopy, which of the following nursing interventions would the nurse include
A．Inserting a nasogastric tube 12 hours before the procedure.
B．Cleansing the bowel with laxatives or enemas.
C．Administering an antibiotic to decrease the risk of infection.
D．Spraying a local anesthetic into the client's throat to calm the gag reflex.