Final answer:
ROPS, which stands for Roll-Over Protective Structure, will not be fully effective if a seatbelt isn't worn because the seatbelt keeps the operator within the ROPS's safety zone during a rollover.
Step-by-step explanation:
The statement 'ROPS will still work if you don't wear a seatbelt' is false. ROPS stands for Roll-Over Protective Structure, which is designed to provide a safety zone around the operator in the event of a rollover. However, for ROPS to be effective, the operator must also be wearing a seatbelt. The seatbelt keeps the operator within the safety zone that the ROPS creates. Without a seatbelt, the operator may be thrown outside the protective zone, which can lead to severe injuries or fatalities.