What will happen to a test dummy during a crash test if its seatbelt is not buckled?

The test dummy will stop when the car stops.
The test dummy will continue forward until it makes contact with another object.
The test dummy will strike and rebound continuously within the interior of the car
The test dummy will remain motionless.

The test dummy will continue forward until it makes contact with another object. This could result in the dummy striking the interior of the car or being ejected from the vehicle, leading to potentially severe injuries. Properly buckling the seatbelt is essential to prevent this type of scenario during a crash test.