What is unlawful regarding the display of registration plates on motor vehicles?

Answer: C — Failing to attach the registration plate to the rear

Displaying a registration plate on a motor vehicle is subject to specific legal requirements. One of the fundamental rules is that each motor vehicle must have a registration plate securely attached to both the front and rear of the vehicle, unless exempted by law. Failing to attach the registration plate to the rear is unlawful because it does not comply with the state’s requirements for identification of the vehicle. This could hinder law enforcement efforts in identifying vehicles involved in incidents or violations. The presence of a rear registration plate is important for lawful operation and compliance with identification standards. If a motor vehicle does not have this plate, it is considered improperly registered, which can lead to penalties or citations. The other choices represent actions that are also not compliant with motor vehicle regulations, but they focus on different aspects of plate display that may not be viewed with the same immediacy or severity as the failure to affix a registration plate altogether. Therefore, the requirement for having a registration plate securely attached to the rear of the vehicle is essential for lawful operation and identification on the road.