Which of the following could lead to vehicle impoundment?

Driving without a valid license can lead to vehicle impoundment because it poses a significant risk to public safety and violates state laws. When a driver operates a vehicle without a valid license, they are essentially not authorized to be on the road, which can indicate a lack of responsibility or inability to adhere to driving regulations. Law enforcement officers are likely to impound the vehicle to prevent unlicensed driving and ensure compliance with licensing laws.

In contrast, while the other options, such as missing decals, repeated parking violations, or failing to yield at stop signs, could potentially result in fines or penalties, they may not necessarily lead to immediate vehicle impoundment depending on the severity and circumstances. For instance, missing decals could result in a citation, and repeated parking violations might lead to fines or tickets but not automatically to impoundment without additional enforcement considerations.