Correct Answer: A

Rationale: Setting clear and consistent boundaries is the most therapeutic nursing intervention when caring for a client with borderline personality disorder. This approach provides structure, promotes predictability, and helps prevent manipulative behaviors. By establishing boundaries, the nurse can maintain a safe therapeutic relationship with the client. Allowing the client to vent their feelings without interruption (Choice B) may not always be beneficial, as it could reinforce maladaptive behaviors. Encouraging participation in group therapy (Choice C) can be helpful but setting boundaries is more critical for individualized care. Providing the client with frequent reassurance and support (Choice D) may not address the underlying issues and can contribute to dependency rather than fostering independence and coping skills.

Correct Answer: B

Rationale: The best nursing intervention for a client with borderline personality disorder expressing fear of abandonment is to set limits on the client's behavior and enforce them consistently. This approach helps establish boundaries and provides a sense of security for the client. Choice A may provide temporary reassurance but does not address the core issue or help the client develop coping strategies. Choice C is important but should be accompanied by setting limits to address the underlying fear of abandonment. Choice D of rotating staff frequently can exacerbate the client's fear of abandonment by reinforcing the idea of being left.

Correct Answer: B

Rationale: Clients with anorexia should not be allowed to plan or prepare food for unit activities, as this can reinforce their perception of self-control. Allowing the client to serve dinner trays (C) may trigger distress or unhealthy behaviors. Therefore, it is best to provide an alternative suggestion for the client to participate in the unit's activities (B). Encouraging the client to assist with other activities (A) may inadvertently reinforce negative behaviors related to food. Explaining to the client that she cannot participate in serving dinner trays (D) without offering an alternative does not address the client's desire to help and may lead to feelings of rejection.

Correct Answer: B

Rationale: The correct intervention for a client with bulimia nervosa is to observe the client for 30 minutes after meals. This helps prevent purging behaviors, such as vomiting or using laxatives, which are common in bulimia nervosa. Choice A is incorrect because eating meals alone may enable the client to engage in purging behaviors without being observed. Choice C is incorrect as a high-calorie diet may exacerbate the client's concerns about weight gain. Choice D is incorrect because encouraging daily weigh-ins can reinforce obsessive thoughts about weight and body image.

Correct Answer: B

Rationale: The best nursing intervention for a client with OCD who spends excessive time checking locks is to encourage the client to discuss the thoughts and feelings behind the behavior. By exploring the underlying anxiety and triggers, the client can gain insight and work towards behavior modification. Choice A is incorrect because enabling the behavior does not address the underlying issues. Choice C is incorrect as it may lead to increased anxiety and distress. Choice D is incorrect as it does not address the root cause of the behavior.