Which of these is a common safety feature in roller coasters?

Over-the-shoulder restraints are a common safety feature in roller coasters designed to secure riders during the ride experience. These restraints help to prevent riders from being ejected from their seats, especially during sudden drops, inversions, or sharp turns where lateral forces are significant. By providing a secure fit over the shoulders, these restraints add an extra layer of safety beyond traditional lap belts, ensuring that riders remain safely in their seats throughout the ride.

In contrast, while screw-lock seats or manual lap belts may seem like viable safety options, they are not as widely recognized as standard safety features in modern roller coasters. Most contemporary designs prioritize lap bars and over-the-shoulder restraints for maximum safety and comfort. The option of "None of the above" is also not applicable here since over-the-shoulder restraints are indeed a standard feature found in many roller coasters, demonstrating the industry's commitment to rider safety.