Choice A rationale:

This choice is inappropriate. In anorexia nervosa, encouraging the client to eat more may not address the underlying psychological and emotional issues related to the disorder. It oversimplifies the complexity of the disorder and could further exacerbate the client's anxiety about weight gain.

Choice B rationale:

This choice is inappropriate. Telling the client to stop restricting food intake oversimplifies the challenges of anorexia nervosa. Recovery involves addressing both the physical and psychological aspects of the disorder, and such a statement may not provide the necessary support and understanding.

Choice C rationale:

This choice is accurate. This statement acknowledges the client's fear of gaining weight while also emphasizing the importance of their health. It demonstrates empathy and understanding while promoting a balanced perspective on the client's concerns.

Choice D rationale:

This choice is inappropriate. Encouraging the client to exercise more as a way to increase appetite overlooks the fact that anorexia nervosa is not solely about appetite suppression. The disorder involves complex psychological factors that cannot be addressed through simple solutions like increased exercise.