Ruby, a College Student, Was Admitted Due to Persistent Abdominal

Ruby, a college student, was admitted due to persistent abdominal pain, nausea, vomiting, and difficulty in swallowing. The doctor orders for an upper GI series. Nursing preparation for this procedure includes:

A) NPO for 24 hours before the procedure
B) Administering an enema or cathartic to enhance visualization
C) Discouraging the client from smoking the morning of the procedure because smoking can stimulate gastric motility
D) Instructing the client that the test involves insertion of a rubber gastroscopy tube