Final answer:
For a client with bulimia nervosa worried about weight gain, the nurse should acknowledge their fear and redirect focus to positive accomplishments, aiding the recovery process.
Step-by-step explanation:
The appropriate response for a nurse caring for a client who has bulimia nervosa and is concerned about gaining weight after stopping purging behavior would be option C: "I understand you have concerns about your weight, but first, let's talk about your recent accomplishments."
This response is supportive and acknowledges the client's concerns while redirecting their attention to the positive progress they have made in their recovery journey. It encourages the client to focus on their achievements rather than on the fear of weight gain, which is a central aspect of their eating disorder.