After obtaining a Class B bus driver's license, which vehicle are you not licensed to drive?

To understand why the choice concerning the Class A bus is correct, it's important to know how the licensing classifications work. A Class B bus driver's license permits the holder to operate certain types of vehicles, primarily those that fall under Class B or below, which includes large buses and trucks that weigh over a certain limit but do not require a Class A license.

A Class A license is necessary for driving combination vehicles with a gross combination weight rating (GCWR) of 26,001 or more pounds, including trailers weighing over 10,000 pounds. Since a Class B bus license does not include permission to drive vehicles classified as Class A, a driver with only a Class B license would not be authorized to operate a Class A bus or any combination vehicle falling within that category. Therefore, this clarifies why the choice referring to the Class A bus is the correct answer.

Additionally, the other options such as Class C bus and Class B truck fall under the licensing privileges granted by a Class B license, which is why they can be operated without any additional licensing requirements.