What does a seatbelt help prevent?

• Head injuries
• Being thrown out of the vehicle during a collision
• Collision of passengers with each other in the car
• All of the above
  Explanation:

  "Seatbelts are designed to: (1) Prevent head injuries by keeping you securely in place, (2) Prevent ejection from the vehicle during a collision, (3) Reduce the risk of passengers colliding with each other inside the vehicle during sudden stops or crashes."