What is generally prohibited regarding firearms in motor vehicles according to Title 21?

The prohibition on discharging firearms from a motor vehicle under Title 21 is grounded in safety and public order. When a firearm is discharged from a vehicle, it can create a significant risk to both the occupants of the vehicle and people or property nearby. The law aims to minimize the chances of accidents, injuries, or fatalities that might occur as a result of reckless handling of firearms in a mobile setting, where control and accuracy are already compromised due to the vehicle's movement.

Discharging firearms from a vehicle can lead to uncontrolled scenarios, where stray bullets can cause harm to innocent bystanders or create chaos in the surrounding environment. This rule serves as a preventive measure to ensure that firearms are handled responsibly and only in appropriate circumstances, such as designated shooting ranges or private properties where safety protocols are in place.

Other options may pertain to lawful firearm possession and use but do not encompass the specific concern that discharging a firearm while in motion brings to public safety. Thus, the correct answer highlights the critical importance of maintaining safety standards and the prudent handling of firearms.