At what age must all passengers wear seat belts in Indiana?

Answer: C — Passengers under 16 years old

In Indiana, the law mandates that all passengers under the age of 16 must wear seat belts while traveling in a vehicle. This age requirement is established to enhance safety for younger passengers, who are often more vulnerable in the event of an accident. The responsibility for ensuring that passengers adhere to seat belt laws generally lies with the driver, emphasizing the importance of protecting all occupants within the vehicle. It is crucial to note that while passengers older than 16 are not subject to this specific law, it is still highly encouraged for everyone to wear seat belts for their safety.