Wearing a seat belt and shoulder harness __________.

Wearing a seat belt and shoulder harness is crucial for safety during a vehicle collision. This safety equipment serves several important functions which include:

1. Keeping you from being thrown against other occupants in the vehicle: During a crash, the force of the impact can cause passengers to lurch forward. Seat belts help secure individuals in their seats, reducing the risk of injury from colliding with other passengers.

2. Doubling your chances of surviving a collision: Research has shown that wearing seat belts significantly increases the survival rates in accidents, effectively reducing the severity of injuries sustained.

3. Preventing ejection from the vehicle: One of the most severe outcomes of a collision is being thrown from the vehicle, which can lead to serious injuries or fatalities. The seat belt and shoulder harness combination helps keep passengers secure within the vehicle, providing an essential layer of protection.

Therefore, since each of these statements is true and collectively emphasizes the critical nature of seat belts and shoulder harnesses in enhancing passenger safety, selecting "All of the above" correctly acknowledges the full scope of their protective benefits.