During postprandial monitoring, a female client with bulimia nervosa tells the nurse, "You can sit with me, but you're just wasting your time. After you sat with me yesterday, I was still able to purge. Today, my goal is to do it twice." What is the nurse's best response?
A. "I trust you not to purge."
B. "How are you purging and when do you do it?"
C. "Don't worry. I won't allow you to purge today."
D. "I know it's important for you to feel in control, but I'll monitor you for 90 minutes after you eat."