Which of the following vehicles can be driven with a Class B Driver's License?

A Class B Driver's License in California allows the driver to operate specific types of vehicles that have a gross vehicle weight rating (GVWR) exceeding 26,000 pounds. This includes single vehicles, such as large trucks or buses, that meet this weight requirement. The importance of the GVWR lies in its ability to indicate the maximum weight that a vehicle can safely carry, and a Class B license is geared towards larger, heavier vehicles which are regulated for safety and roadworthiness.

The other options do not meet the criteria established for a Class B license. For instance, a vehicle with a GVWR of more than 30,000 pounds (though it exceeds the weight limit) is not classified correctly for this type of licensing in terms of single vehicle operation, as a Class A license would be required in that scenario. Motorcycles or scooters are governed by different licensing requirements, specifically for motorcycles, which means that option about motorcycles is clearly not applicable to a Class B license. Lastly, vehicles under 20,000 pounds can be operated with a standard Class C license, not requiring the more specific Class B. Therefore, the chosen option correctly aligns with the definition and limitations of what a Class B Driver's License covers.