What should be used to stabilize a victim before retrieval from the water?

To stabilize a victim before retrieval from the water, the use of a flotation device is crucial. A flotation device provides immediate buoyancy, helping the victim remain afloat and reducing the risk of drowning. It also helps calm the individual, as they can hold onto the device while waiting for rescue, providing both physical and psychological support.

Using a flotation device ensures that the victim is secure and can breathe while rescue operations are underway, which is essential in a water rescue scenario. Proper stabilization can prevent further complications, such as a panic response from the victim or additional risk of injury or drowning.

In contrast, while other items like a weighted rescue line or buoyancy aid may assist in other aspects of rescue operations, they do not offer the same level of direct support and stabilization that a flotation device provides. A waterproof backpack is not designed to assist in stabilization and would not serve the purpose of keeping the victim safe and buoyant in the water.