Final answer:
Semitrailers and trailers that are 80 inches or wider must be equipped with clearance lamps, side marker lamps, and side reflectors per federal safety regulations.
Step-by-step explanation:
The question pertains to the equipment requirements for semitrailers or trailers in terms of lighting and reflectors. Specifically, it questions the width at which vehicles must be equipped with clearance lamps, side marker lamps, and side reflectors. According to the Federal Motor Carrier Safety Regulations, all trailers or semitrailers with a width of 80 inches or more must be equipped with clearance lamps, side marker lamps, and side reflectors. So the correct answer is 2) trailers or semitrailers with a width between 80 and 96 inches must be equipped with these safety features.