Which action should be taken if a person is unconscious but breathing?

When a person is unconscious but still breathing, placing them in the recovery position is the appropriate action to take. This position helps ensure that their airway remains clear and open, preventing choking or aspiration if they vomit or have any other obstructions. The recovery position also allows for easier access to breathe if any complications arise.

This option is crucial because maintaining an open airway is a priority in first aid. By positioning the person on their side, it promotes drainage of any fluid from the mouth and reduces the risk of suffocation. Additionally, this position allows for monitoring the person while waiting for emergency personnel to arrive, ensuring that any changes in their condition can be dealt with promptly.

Other options, such as performing CPR, are not suitable in this situation because CPR is only indicated when the person is not breathing or has no pulse. Shaking someone to try to wake them could potentially cause further harm, especially if there's an underlying head or spinal injury. Leaving the individual unattended is also ill-advised, as they may require assistance or medical intervention if their condition changes.