What is the primary purpose of a driver's license?

Answer: B — License to drive a car

The primary purpose of a driver's license is to serve as a legal document that permits an individual to operate a motor vehicle, specifically a car, on public roads. A driver's license indicates that the holder has met the necessary requirements to drive safely and responsibly, which generally includes passing written, vision, and possibly driving skills tests. This ensures that all drivers have a basic understanding of traffic laws, road signs, and safe driving practices. While other options mention specific types of vehicles or uses for identification, they don't represent the fundamental role that a driver's license plays in establishing the right to drive. A motorcycle license, for instance, is a separate certification, and operating commercial vehicles requires additional endorsements or licenses. Although a driver's license can be used to validate identity in other contexts, such as voting, that is not its primary purpose. The core function remains focused on granting permission for personal transportation using standard motor vehicles, which is why the answer about driving a car accurately captures the main intent.