A nurse is caring for a client in a mental health facility. The client is agitated and threatens to harm herself and others. Which of the following is the nurse's priority intervention?

Choice A reason: Restraints are a last resort and should only be used when less restrictive interventions fail. They carry risks and require strict protocols. Choice B reason: Setting limits is important for behavioral management but does not address the immediate risk of harm. It is not the priority in an acute crisis. Choice C reason: Seclusion may be necessary if the client poses a danger, but it is also a restrictive intervention. It should follow failed attempts at de-escalation and medication. Choice D reason: Administering an anti-anxiety medication is the least restrictive and most immediate intervention to reduce agitation and prevent harm. It addresses the underlying emotional state and promotes safety.