Under which circumstance might a driver be disqualified from operating a CMV?

Answer: B — Leaving the scene of an accident involving a CMV

A driver might be disqualified from operating a Commercial Motor Vehicle (CMV) for leaving the scene of an accident involving a CMV because this action typically indicates a serious violation of traffic laws and safety regulations. It is considered a criminal offense in many jurisdictions and reflects a disregard for the law and the safety of others. Such behavior can result in significant legal consequences, including license suspension or revocation, thereby disqualifying the individual from operating a CMV. Conversely, having a valid driver's license, successfully passing a physical exam, or attending a defensive driving course do not represent circumstances that would disqualify a driver. These actions generally contribute to maintaining or improving a driver's qualifications rather than diminishing them. Having a valid license is a foundational requirement for driving legally, passing a physical exam ensures the driver meets health standards required for safe driving, and completing a defensive driving course can enhance driving skills and knowledge.