Which of the following is an appropriate first aid response to choking?

The Heimlich maneuver is the appropriate first aid response to a choking incident because it is specifically designed to dislodge an obstruction from a person's airway. When someone is choking and unable to breathe, cough, or speak, this technique applies abdominal thrusts to create a pressure increase in the diaphragm, which can effectively expel the lodged object from the airway.

This method is widely recognized as the standard response and is taught in first aid courses to ensure that responders can act quickly and effectively in emergency situations. The Heimlich maneuver is safe and can be performed by trained individuals and laypersons alike.

In contrast, while encouraging a person to cough can be beneficial in some choking situations, it is ineffective if the person cannot cough, talk, or breathe properly. Providing a glass of water is not advisable because it can worsen the choking if the object does not dislodge. Lastly, slamming the person on their back is not a recommended practice for choking and may even cause further harm or obstruction if not done correctly. Therefore, the Heimlich maneuver is the most appropriate and effective response in choking emergencies.