The device that helps protect riders from the effects of inertia in an event of an accident is : ( D ) Seatbelts
Functions of seat belt
Seat belts are safety devices installed in cars to safeguard the occupants of a car from harmful sudden movements such as sudden collisions ( accidents ) or an emergency stop by the driver. They practically protect the passengers from the effects of inertia in these events as mentioned.
Hence we can conclude that The device that helps protect riders from the effects of inertia in an event of an accident is seat belts.
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