Final answer:
The most appropriate nursing action when a client with congestive heart failure is not following the prescribed diet is to discuss the diet with the client to learn the reasons for not following it.
Step-by-step explanation:
The most appropriate nursing action when a client with congestive heart failure is not following the prescribed diet is to discuss the diet with the client to learn the reasons for not following it. Noncompliance with a prescribed diet is a common issue, and it's important for the nurse to understand the client's reasons for not adhering to it. By discussing the diet with the client, the nurse can identify any barriers or challenges and provide education and support to promote adherence.
Discharging the client from home health care (option A) is not the best initial action, as it does not address the underlying issue of noncompliance. Notifying the healthcare provider (option B) may be necessary if the client's health is at immediate risk, but discussing the diet with the client is a more appropriate initial step. Making a referral to Meals-on-Wheels (option D) may be considered if the client is experiencing difficulty with obtaining or preparing appropriate meals, but it is not the first action the nurse should take.