A nurse is attending a social event when another guest coughs weakly once, grasps his throat, and cannot talk. Which of the following actions should the nurse take?

The correct answer is A: Perform the Heimlich maneuver. This action is appropriate for a choking individual who is unable to speak, cough weakly, and grasp their throat, indicating a partial airway obstruction. The Heimlich maneuver is designed to dislodge the obstruction by applying abdominal thrusts. This is the most effective intervention in this scenario to clear the airway and restore breathing. Slapping the client on the back (B) may not effectively remove the obstruction. Mouth-to-mouth resuscitation (C) is not indicated for a conscious choking person. Observing the client (D) without taking immediate action can lead to a worsening situation.