Final answer:
The therapeutic response that summarizes the client's concerns about their weight and use of laxatives in relation to anorexia nervosa is option b.
Step-by-step explanation:
The student is referring to a scenario involving a nurse counseling an adolescent with anorexia nervosa, who exhibits symptoms such as excessive laxative use and a fear of gaining weight. The correct therapeutic response that demonstrates the nurse's use of summarizing is: "You're saying that you think you are fat and are using laxatives because you are afraid of gaining weight." This statement encapsulates the main points the client has made about their body image and behaviors, effectively summarizing the discussion to clarify understanding and facilitate further conversation.