Which of the following can result in asphyxia?

Strangulation specifically leads to asphyxia because it directly restricts airflow to the lungs by applying pressure to the neck, which can obstruct the trachea or restrict blood flow to the brain. This lack of oxygen can result in unconsciousness and, if not relieved quickly, can lead to death.

While the other options can cause significant injury and may potentially lead to situations where asphyxia could occur indirectly, they do not specifically cause asphyxia in the same direct manner. Fractures might result in swelling or position that impacts breathing, burns can affect the airway if inhaled smoke or hot air is involved, and gunshot wounds can lead to a variety of traumatic injuries, some of which may indirectly lead to breathing issues but do not directly imply asphyxia like strangulation does. Strangulation is uniquely tied to the mechanism of preventing breathing, thus making it the correct answer in this context.