When observing an ostomate (a person who has had an ostomy) do a return demonstration of the colostomy irrigation, the nurse notes that he needs more teaching if he:

A. Stops the flow of fluid when he feels uncomfortable

B. Lubricates the tip of the catheter before inserting it into the stoma

C. Hangs the bag on a clothes hook on the bathroom door during fluid insertion

D. Discontinues the insertion of fluid after only 500 ml of fluid has been instilled