Which of the following modifications is considered illegal for snowmobiles?

Removing lights or safety features from a snowmobile is considered illegal because it compromises the vehicle's safety and functionality. In most jurisdictions, snowmobiles are required to have certain safety equipment, including lights, signals, and brakes, to ensure the safety of the rider and others on the trail or road. These features are essential for visibility, communication with other vehicles, and stopping capability. Removing them can lead to accidents and endanger both the rider and the public, which is why such modifications are prohibited by law. Maintaining all required safety features is critical to compliance with regulations and to promote safe riding practices.