What is the height requirement for a motorcycle's tail lamp?

The correct choice outlines that the height requirement for a motorcycle's tail lamp is between 20 inches to 72 inches from the ground. This specification is part of the regulations ensuring that tail lamps are adequately visible to other motorists, which is crucial for safety on the road. A tail lamp positioned within this height range ensures that it can be seen from a sufficient distance under various conditions, contributing to the overall visibility and safety of the motorcycle. Proper height placement is particularly important because motorcycles are smaller than most vehicles, and their lighting needs to be effectively utilized to signal the rider's presence to other drivers. Having a tail lamp within the designated height helps prevent accidents and enhances the safety of the rider.