Which item would be most appropriate to use when controlling severe bleeding?

Gauze is the most appropriate item to use when controlling severe bleeding due to its absorbent properties and versatility. It is designed specifically for medical purposes, allowing it to effectively soak up blood and promote clotting when applied directly to a wound. Gauze can be layered or packed into a wound, which is essential for managing severe bleeding, as it helps control blood flow while providing a clean barrier that minimizes the risk of infection.

In contrast, the other options are less suitable for severe bleeding situations. An alcohol swab is used for disinfecting skin but does not have any capacity to absorb blood or apply pressure. Absorbent pads might be useful in some contexts but are generally less effective than gauze for severe bleeding due to their size and thicker design, which may not conform well to wounds. A bandaid is intended for minor cuts and abrasions and lacks the necessary absorbency and coverage for serious bleeding wounds. Therefore, gauze stands out as the best choice for effective and immediate first aid in cases of severe bleeding.