A learner's permit holder may not operate a motor vehicle between which hours unless they are 18 years old or accompanied by a parent?

The correct choice indicates that a learner's permit holder is prohibited from operating a motor vehicle between the hours of 12:00 am and 5:00 am unless they are accompanied by a parent or guardian or have reached the age of 18. This restriction is in place to ensure that new drivers, who may lack experience, do not drive during late-night hours when road conditions can be more hazardous and when fatigue can be more likely to occur.

If a learner's permit holder is driving during these hours without appropriate supervision or age, it can pose increased risks to both the driver and other road users, which is why such regulations are instituted. Being accompanied by a parent or guardian provides a level of oversight and guidance, helping to mitigate potential dangers associated with driving at night.