Which of the following best describes a school bus?

A school bus is specifically defined as a motor vehicle designed to carry 11 or more passengers, including the driver. This distinction is important for regulatory and safety reasons, as vehicles designed to transport larger groups of people must adhere to stricter safety standards and operational regulations, particularly when it comes to their use in transporting children.

In contrast, the other choices do not accurately capture the definition of a school bus. For instance, a vehicle limited to carrying no more than 10 passengers is classified differently and does not meet the requirements for a school bus designation. The option referring to a vehicle used exclusively for sports events is also not relevant, as that does not reflect the primary purpose of a school bus. Lastly, while a school bus is indeed a transport vehicle, the term "public transportation" is generally more associated with services like city buses or vans that serve general public transit needs, rather than the specific function of a school bus focused on transporting students.