Final answer:
The head tilt-chin lift maneuver involves applying pressure to the patient's forehead while lifting the chin, and it is used to prevent the tongue from blocking the airway in an unconscious patient, but should not be used if cervical spine injury is suspected.
Step-by-step explanation:
The correct statement regarding the head tilt-chin lift maneuver is c) It involves placing pressure on the patient's forehead and lifting the chin. This maneuver is a first aid procedure used to prevent the tongue from obstructing the airway of an unconscious patient. It is important to note, however, that the head tilt-chin lift maneuver is contraindicated in patients with suspected cervical spine injury, as it may cause further damage to the spine. In cases of suspected spinal injury, a jaw-thrust maneuver without extending the neck is preferred.